lukaszthegreat: Calling them not human being gives the idea that they originate from somewhere else. That they were never part of human society and "species".
Just because you are a part of something, it doesn't mean you stay a part of it for eternity.
You legally stop being a human being after you die, you can also stop being a human being after you do something so unthinkable, so cruel, so ruthless, the humanity would definitely be better without you.
Just like you make some offence and you get kicked from your local chess club, you can be "kicked out" from humanity for your actions in my book.
It doesn't mean you can't go back. But he clearly didn't even want to come back.
There is a serial killer-pedophile just about to come out of prison in Poland. He said numerous times, he will kill another kid as soon as he goes out. He's not a human in my book, doesn't deserve a humanitarian treatement as well. Maybe it makes me not human as well.
What I know for sure, I won't be patronizing here and tell others they shouldn't feel good about somebody else's passing. Just because somebody breaths, it doesn't make him just as worthy of anything as others. I wouldn't dare to tell the families of the victims to not being joyful about his death.
The world is definitely a better place without him in my eyes.