To commit evil is definitely human with our larger brains. It's oftentimes a glitch in our brains, a chemical imbalance and yet we look down on animals with all our false superiority.
To deny someone isn't human because they committed evil is to deny that humans are capable of committing evil, right?
To deny that ANYONE is human, no matter what they've done, is to open the door of dehumanization, which is a slippery slope. Dehumanization is how genocides get started.
sounds about right to me
More or less. It's an emotional response rather than rational.
No, I think when they say that it means they are a monster, ie not human. People think about things from a personal perspective, and their are just some crimes that are so horrendous no person of right mind, or normal character (love and empathy and good conscience) could commit, hence non human.
I think it depends on what qualities you feel constitute being human. Obviously evildoers are human in the biological sense, but lack humanity in the psychological sense.
There is no denying that humans are capable of evil, we see it by every description every day; but in cases of the most heinous evils, critical aspects what of makes one entirely human (empathy, reason, dignity, compassion) are absent, a subspecies emerges:
These be monsters.