They dehumanize themselves without our help, by killing or raping.
Ever seen a lung cancer patien killing , cutting to pieces, raping,cutting off organs, heads, eyeballs, drinking blood?? I didnt.So you cant compare here, but you can compare them to idiots and retards, they too are ill, and not normal, they to need help,but most wont stop being idiots, and downs, but they are
NOT a danger for society while all those freaks like maniacs, rippers, sexual maniacs, phedophiles, are, so death penalty should be for monsters who dont deserve to live a day, if you think that they can be cured then visit some sites, read some books about maniacs, and killers like Chikatila, Bundy, Onoprienko and others, maybe then your vew will change. Also if you say serial killers need help then , did you watch Freddy Kruger? Bet you did, most people seen thoose movies so in your view Freddy should be treated in hospitals, and we should try to make him a normal man?