Penty of people stop other criminals with guns with theior own weapons. they just dont make big media stories because they dont push the anti gun agenda. but there are many more than this as this is just one link i clicked on in google, and I often see these articles pop up on drudge.
http://nakedlaw.avvo.com/crime/8-horrible-crimes-stopped-by-legal-gun-owners.html

1. Marine opens fire in apartment parking lot

An Oklahoma City marine who was on leave suddenly began opening fire in the parking lot of his apartment complex late last year. Witnesses said he originally tried to go into the apartment complex’s main office, but after employees locked him out, he started to fire his gun in the parking lot. As he was firing, another citizen with a concealed handgun came around the corner and ordered him to drop his weapon. It worked and no one was hurt.

2. Restaurant owner shoots, kills armed robbers

Just a few short days ago, 2 suspects walked into a restaurant to order food. When the employee opened the register, one of the men pulled a handgun and threatened the employees. The suspect then reached over the counter and grabbed the money. He then turned and pointed the gun toward the owner of the restaurant who was sitting at a table in the middle of the restaurant. The owner pulled out his own gun, shot the criminal in the chest, and killed him.

3. Man killed in attempted robbery

In November 2009, career criminal Kevin Duane Dudley walked into an Alabama business with a sawed-off shotgun to commit armed robbery. Thankfully, some shoppers were able to distract Dudley long off for the owner of the store to retrieve his gun and defend himself. The owner ended up shooting and killing the criminal. Dudley had been tied to several other robberies in the area as well as a recent murder.

4. Two armed robbers get shot during home invasion

When two masked men with guns broke into his home and pointed their weapons at one of the residents, Cody Buckler immediately took action. He retrieved his gun from upstairs and began shooting at the criminals. The crooks fled the scene, leaving a trail of blood behind them. The criminals were eventually apprehended.

5. Mass shooting stopped by armed volunteer security guard

In December 2007, Matthew Murray pledged he wanted to kill as many Christians as he could. The 24-year-old went to New Life Church in Colorado Springs and opened fire, killing 4 people in the process. Thankfully, an armed security guard was able to get his her weapon and shoot Murray several times, stopping him from killing any others. However, in the end, it was Murray’s own self-inflicted gunshot that ended up killing him.

6. School shooter stopped by armed college students

In 2002, a shooting at Appalachian School of Law left 3 people dead. However, the shooter was stopped before he could kill any more people. Thankfully, 2 students were able to run to their cars, get their guns, and use their weapons to halt the rampage.

7. Grandma stops intruder

When 69-year-old Ethel Jones heard her doors rattling at 3 a.m., she grabbed her gun from underneath the pillow next to her. She ended up finding an intruder inside her bedroom, forcing her to shoot the teen in the abdomen. The teenager survived and faced charges of second-degree burglary.

8. Pizza Hut delivery driver says his gun saved his life

An unnamed Pizza Hut delivery driver started carrying a legal concealed handgun to work after being robbed twice in the last 2 years. Just last week, he was robbed by 2 armed men inside the restaurant. The men pistol whipped him and as they started to lift the driver’s shirt exposing his gun, the worker pulled out his weapon and opened fire. He said he had no other choice but to act and save his life.

Edit: Everyone should also watch this show http://www.aetv.com/panic-9-1-1/ I have only seen a few episodes, but hearing what these people go through when someone breaks into their house is really eye opening.

Hey I'm not saying it doesn't happen, I'm saying that it's just as rare and not the solution.

Let's stop with "the media bias", ok? It's frankly a little tin-hat-ish.

you said you NEVER heard of it happening. It happens quite often though.So maybe for someone reason the media just doesn't report on it. Maybe its not bias, maybe they dont think it will get them good ratings (maybe you just choose not see it when its reported on, I dont know). Either way, people stop crimes with guns, not just in their homes, but out in public also. Police for the most part can only pick up the pieces after a crime has occured.

Hey I'm not saying it doesn't happen, I'm saying that it's just as rare and not the solution.

Let's stop with "the media bias", ok? It's frankly a little tin-hat-ish.

It isn't just as rare though.  It's a lot more common according to most research.

The only research in which it isn't pretty common is when you make the standard of proof "someone has to fire at you or stab you before you draw a weapon."

That's why you don't hear about it... because it's pretty common.

Afterall you never hear about peoples homes getting broken into either... I wouldn't say that home robberies are particularly rare.

You can claim either side is right on specific instnaces... but the facts and numbers seem to lie pretty heavily on the "Anti-gun control" side.

Which is why a lot of people who wouldn't even want to own a gun tend to end up on that side....

and why popularity of gun control measures only exist right after a tragedy via fear... and then collapse back down to low levels right afterwords.  (47% now, with 53% disliking how Obama has went about gun control... will likely be even lower in a month or so.)

Sorry I didn't mean Never ever, I just meant that it's extremely rare. And judging by your 8 crimes (with examples dating back to over ten years ago), the reports agree.

The case for anti-gun control activists is frankly the same argument the gun control people push. Anti-control people say people are less likely to commit crimes when they know that anyone could possibly be carrying a gun. The pro-gun control people say people are less likely to commit crimes knowing they will be caught.

You can post instances where people having guns stopped crimes, but the other side can do the same. The argument about which stance is better is a dead-end. They both work.

But yes, my only problem with your point is about the media. There is no conspiratorial media bias, because the media will report on anything, they tend not to fudge details because they know they will be called out on it by others' journalistic integrity.

And yes, that's my only problem with your argument, because I know that people having guns helps prevent crime. The question is whether it's better than gun control. A person with a gun can potentially stop a crime, but what if they don't? Where do the police turn for information if there aren't checks put in? How do the police mop up? I agree that people should be allowed to carry weapons to defend themselves, I just don't see the problem with requiring background checks, and paper trails stemming from the second hand market.