Are gangs evil?

Even though what they do is illegal, compared to drug dealers and their families, who do ten times more evil things, and thugs, I don't think given the history, gangs are evil. Crips and Bloods started as a protest against police brutality, when the law was not on their side. I don't think crips and bloods are evil people, just those who feel they have no voice. Same with the Mafia, which didn't start off as a crime family but one who defended themselves against the invasions of Italy by the Goths.