I'm all for people organising themselves into groups. They'll either make space safer or more dangerous and both options will add to game play.
Saying this, vigilantes are just as troublesome as a pirate gang, at least to me. Any formation of player ships is going to be threatening. A group declaring themselves as 'Friends of the Freelancer' or 'Guardian Gankers' could just be a bunch of scallywags trying to get the up on a hapless pilot.

No, better to avoid gangs in space - unless you're a member of one.
