Well I'm not familiar with those kind of environments at all, so nobody should take advice from me on that front. I was raised in a loving home with very calm and patient parents, very much protected.
I have some idea what kind of person I would be had I been raised in some harsh ghetto surroundings. I used to be agressive as a kid(strangling my sister for example and loving the feeling of it, until she stopped resisting(thank goodness she did, really)) and snapped on quite some kids, and vice versa, which could have very well continued and got worse in the opposite of the surroundings I grew up in.
Environment plays such a huge factor. My mother believes I'd have been rioting and wanting to bash heads in when riots took place years back in my hometown had I grown up in the neighbourhood there. The ability to get huge amounts of adrenaline pumped through my body is still there. I think I know what kind of messed up individual I could have become. I don't think I'll ever experience it though. A man learns how to control himself as he gets older. Right? Haha, yeah I'm a really mellow and peaceful dude now. To the point of passiveness when it comes to theft and vandalism. I find it hard to care about posessions really.
Anyway, it's about individuals naturally, there's no clear cut way how to teach life lessons like the fine gentleman in this video is trying to do with his cousin. In my case, my parents way worked. But they're the exception, not the norm. I've been incredibly lucky to have them as parents, which is great AND sad, looking at the bigger picture. Slapping a kid works sometimes(my father had to slap me for making his blood boil on numerous occasions, kids can be such complete and ungrateful cruel insensitive shitheads, even in a loving home) if used consistently(it shouldn't be necessary if you're parenting right, but parenting right is kind of hard for (less able) people), but eh, breaking someones ribcage is a tad excessive.
So to answer your question, I really don't know. But the way that guy was so calm when using his cousin as a bodybag, that is some creepy shit. It seemed like he could be walking past you then turn around and shoot you in the back without feeling anything.