There’s more to this than meets the eye, not everything is black and white.
Mafia helped Italian families because communities were being targeted unfairly by cops. Yakuza were a major part of the restoration of Japan.
Even in Mexico, military and cops realized they were getting fucked formed cartels, which are literally gangs.
Gangs are the result of a failure of government and society. Call them what you will, but painting it like gangs are evil is failing to recognize the nuance.