i can't say i support anonymous. they did good things, they did bad things. most of the time, they're basement-dwellers who get a kick out of being mean to people. i'll call for the stopped clock argument in their case when they target acceptable targets (cp-rings, daesh, other horrible things), and i'll call them douchecanoes when they go after victims (like stalking a girl, doxxing people, ruining individual lives).
as a rule, i tend to flip-flop on vigilante justice, due to the fact it's morally wrong but the schadenfreude is immense. for example, khadafi's death was karmic. a dictator getting fucked over by mob justice? that's the definition of poetic justice. it may be wrong (morally), but i laughed. the same mob chopping the nuts off a presumed rapist because he's from another tribe? yeah, nope. then again, in one case the proof is in the pudding regarding culpability, in the other case all bets are off.