After working at a boys home for a year I came to feel sorry for the people who fall into the gang lifestyle. That being said though, I feel no sympathy for gangs. I feel that mentality is a social retardation.
If gangsters want to leave, and at least make an effort, I respect that and do my best to help if I can. If, however, they choose to continue in the gang lifestyle, I also have no issues killing them, if they start acting aggressive.
This goes for any ethnicity. White, black, Asian, Mexican, Russian, Italian, whatever. Gangs need to be exterminated. If that means a couple gang members die in the process, so be it.