In a way, maybe...
If I understand you correctly, you think the young delinquents are very psychologically damaged, suffering from some psychiatric disorder. I'm sceptical about that. The young delinquents I come across (admittedly not the very worst of them) do not seem psychologically strange to me.
I think there are fucked up sub-kulchas - part of a more widely fucked up society, no doubt - but, at the individual level, the only relevant peculiarity of most young thugs and robbers is slight: that they've bought into the idiotic and fashionable 'gangsta' twaddle more than most people. Among their friends, that's pretty normal and well-regarded.
Depending on circumstances, violence and even killing can be perfectly normal. It does not depend on great psychological peculiarity. Bandits and pirates don't have to be mad to rob and kill. Soldiers in wartime kill without having to be bonkers. Comments from young gang members, including some of the tributes to recently murdered teenagers, strongly suggest that they see themselves in exactly that way - as soldiers (for their gangs, rather than for King & Country).