In your view, these are people that don't wish to integrate themselves, and in my view, these are people that never had much of a chance to begin with. The public schools I went to were so underfunded, and I am lucky that I took a different path than the one of least resistance. A lot of the people I grew up with that joined gangs were abused as kids, had learning disabilities, grew up with violence, didn't have a proper learning environment, didn't have after-school programs to go to when they wanted to avoid violence and abuse at home, etc. I'd rather take money from police departments and funnel it to actually giving those kids a chance.
I had an early life typical of some of these places. My area was not as bad as the one you describe FYI. I made so many mistakes in my own early life that really set me back, some of which could potentially be attributed to the nihilistic attitude of my surroundings. As a result I'm perhaps more sympathetic to the downtrodden people of these areas than you might believe. That being said, my own success in life has made me slightly less sympathetic to these people than I used to be. I underwent a massive attitude change in my early 20s that changed my entire life. I stopped blaming other people for my problems and took responsibility for my life, it was like flicking a switch. All of a sudden everything in my life slowly began to function, I started to receive positive results from my actions. I understand that not everyone can become rich. You'll have greatly different results if instead of becoming a software engineer like I did you're just bagging groceries. That's always going to be the case though.
I truly understand that getting through to kids from broken homes can be difficult when their parents, like mine, have created such a hostile environment for their kids that they base their entire conceptual model of society on their broken home life. Having said that, there's no one out there telling people that getting hooked on hard drugs is a good idea, yet it still happens. These kids know what living a good life looks like. They make their own bad decisions. I really do believe in offering all the support we can to help at-risk children avert ruining their lives. They're not all going to be saved, no matter what you do. I feel like those who are capable, and interested, will always seek out better things for themselves eventually.