You're not being charitable with your interpretation of parent's comment. You quoted the first line, then ignored this: > Everyone is responsible for their act

You're not being charitable with your interpretation of parent's comment. You quoted the first line, then ignored this: > Everyone is responsible for their actions. And some people have a long way to go to before they've healed their traumas. But pretending that some are evil and others are not isn't solving the problem. It's not a rationalization of child-killing. It's a partial explanation as to why some people do that. There's no value judgement being made, just a clinical evaluation of causes and effects. People who commit terrible crimes are responsible for their actions. But it's far too convenient to just label them as evil and move on. Something made them evil. Something wired their brain that way. We are not the authors of our own personalities. Don't misunderstand me. I'm not claiming that all people are redeemable. Some aren't. There are cases where the only rational (and ethical!) thing to do is separate the perpetrator from the rest of civil society, for our own protection. But we do ourselves a big favor if we allow ourselves to question and study the origin of these behaviors. And if we allow ourselves to advance the study of rehabilitation and reform. Just as it is morally correct to protect the society at-large from predators, it is also, I think, a moral requirement to find better ways at fixing broken people. Just like we do with cancer, AIDS, or any other ailment. Expand that to include mental disorders. The brain is another organ. Right now we suck at verifiably correcting for psychological disorders. (Hell, we can't even agree on what constitutes one). Because we're bad at it, we take the safe approach of caging dangerous people. That's fine. It's the best we can do with our current state of knowledge. But we should strive to learn more, so that we can make more accurate decisions on who should remain caged and who is eligible for reform.