So in regards to cars, would it be reaonable to demand, just as one would when it comes to drivers license, that the one who wants to use a gun need to get a license, showing a responsible way to handle the firearm?
The founding fathers had no idea what kinds of weapons would become available in the future, and it´s important to note the phrase in the beginning fo that amendment that clearly specifies that it should be a well regulated militia. This shows that even they themselves say the dangers of not having regulations.
The founding fathers had an idea. They knew what kind of weapons were created in the past, and what weapons were available then. It's not complicated to assume how much more deadly weapons could become in the future based on the history of war. What those weapons were going to be exactly, is harder to predict, but the death and destruction they could easily assume. Remember, guns were about as deadly a weapon as you could have back then, and they said everybody can have one. Much of the Constitution clearly wasn't written just for that time period either. They thought ahead quite well back then.
Gun laws should be the same across the entire Country with minor exceptions. I'll give you that. Some of the states could tighten up some loose ends and make acquiring gun related items harder in general for citizen's, and next to impossible legally, for certain high risk individuals. While that may potentially lead to less deaths overall, maybe, events like Vegas could continue regardless. Apparently he passed all the checks no problem. Would stricter gun laws have stopped him from getting weapons capable of hurting hundreds? No amount of gun laws is going to completely stop somebody who's decided to kill a bunch of people.
Just like the Australia comparison, if you make it harder or impossible to get your hands on one type of weapon, they will just use the next best thing that's more easily attainable. Even if all of the guns were taken away, and all you saw from time to time was a mass shooting using illegal guns, it would still be all over the news crying for answers, late night hosts pleading for more black market policing, and poiliticans would still be pointing fingers. How is that any different than what's happening right now? The news, politicians, and people, didn't really care about gun laws for the entire last year, but now because of a mass shooting, it's important again for some reason and applies to all guns, and all people, apparently.
America's biggest problem by far is not the guns. It's that they are a nation, based on it's history, that initially tries to negotiate, but if the other party clearly doesn't want to try and come to terms, well then just use force. America has gotten better at this over time, but will use their military might much sooner than many other first world nation's. When your Country runs like that, the people tend to follow that example. A Country and it's people are like parents and their children. You set an example and they grow around that. If that example is move or get out of the way, they grow up with that mindset, and they live it everyday to some extent. It tends to lead to higher levels of violence, which can lead to events like Vegas.