You are really understanding Moore’s point in V for Vendetta. His whole point is that good and evil are subjective. Which, as far as I can tell, is true in the real world.

V is really not better than the people he is fighting and he has no plan for the aftermath, which will clearly be a horror show.

And I guarantee you plenty of members of Anonymous committed their own horrible acts that would be considered evil by others. Being part of a good cause does not make you a good person.