When is murder justified by self-defense?

[Azuren]

I see a few people who keep saying things like "the burglars have human rights".

No, they don't. They're worthless husks of trash that need to be treated as such and taken out.

Growing up, there was an older couple that lived down the street that thought like that. Bleeding Hearts, real noble people. All that went to shit when some illegals broke into their house because they have a nice car and old people are easy targets. Their unwillingness to properly defend their home cost the husband his life and in an act of disgusting monstrous behavior, the wife's dignity.

They were apprehended and sent to jail where they awaited deportation. (Pseudo-happy ending, they weren't deported, they are killed in jail by biker gang members).

How could this story have changed? The husband could have treated them as what they are; animals that needed to be put down. He could have grabbed his gun when the security went off and, at the very least, killed one. The gunfire would have alerted neighbors and authorities alike. The damage caused could have been mostly avoided.

Caring about other humans, as I said, is noble. But there's nothing human about breaking and entering. It's an act of selfish greed, and I will feel no remorse of I ever have to perform an emergency full frontal lobotomy on an intruder in my home. My only worry is cleaning up the blood.