Actually the gangs in the Hounslow/Southall region in the 80s were amongst the most violent around (admittedly mostly inter-Asian gangs). Look up the "Holy Smokes". There were gang-related riots practically on my doorstep in the mid-90s.You probably didn't grow up in an area with gang culture and massive poverty either.
The best way to get out of poverty is to educate your way out of it. Society in this country is NOT a means of blame, there are opportunities if you work hard enough. Look at David Lammy, Tottenham's MP. Black, single parent family, now a widely-respected MP.