Psychopaths lack something that is pretty much key to being human, empathy. Without this, they are dangerous and really give nothing to society. If you lack empathy (humanity), can you be considered truly human? If not, what should be done to psychopaths? Do they deserve to stick around and be a threat to "humans"?
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And no, I am not promoting open season on psychopaths ... although I feel nothing for them. Just asking what people think about this subject.