Locking them away seems like a waste of our time, resources and man-power. I say just kill them, if the crimes they commit are truly egregious (like murder or rape).
And they no doubt feel like killing you would lead to their own longevity, as well. That's exactly the point. The right answers are usually not easily arrived at, in situations like this. To say that your life inherently has more value than another's is to invite them to challenge that claim. Your life, quite simply, has no value at all. Neither does theirs. Or mine. Value is an abstract created by human minds, it isn't a concept of nature. And as with any abstract, it is malleable to human perspective. Your perspective is that murder is acceptable under certain circumstances. The people you wish to murder feel exactly the same way, however. You only justify their murder by murdering them back.
Additionally, to compare a human to any baser animal is counter-intuitive, since an animal cannot be reasoned with. You might argue that some humans cannot be reasoned with, but that is entirely untrue. You simply have to have an understanding of how to bypass their biases. It's seldom easily achieved, but it is possible, nevertheless. To take the easy, murderous route is to say that doing the right thing isn't worth your time, which is also something your murderous brethren agree with you on. Your perspective isn't so different from those you demonize.
And as far as prison goes, that is the one thing we can agree on, at least in part; the mega-corporations that own and profit from the prison institutions are very good at scaring people into consenting to allow them to practice their slave-trade. But the fact remains that while there, these people are immersed in violence, paranoia and drug-abuse. There has only recently been a reasonable increase in rehabilitative programs, despite the constant empty promises that they're looking into how to treat inmates so they're less apt to return, and yet the problem isn't taken seriously enough. People like yourself would rather kill anyone whose life has gone to **** or stick them in a hole and forget about it rather than face the fact that callous, unfeeling people like yourself are the root cause of the existence of such criminals in the first place. Are some people born with an overactive medulla oblongata? Of course. But environment plays just as large a part in
reducing the person's likelihood to commit a crime as to make them more apt to.
You're either part of the solution or you're part of the problem, dude. Promoting murder doesn't make people less apt to commit murder, it only shows them that there are other angry, inconsiderate people out there, too. If you want more people to become criminals, keep showing them you don't care what they've gone through. If you're lucky, maybe you won't meet someone you could've shown some compassion to in a dark alley while walking your wife and kids home.