Though I suppose if you're too lazy to just shoot their npc's...
That could screw up your rep with other factions, though, and is really hard if there's 185 people online.
Say you've ticked off the Rogues, and only the Rogues. Somehow, no one else cares. Shoot the Rogues and you'll have the Hackers, Mollys, Outcasts, and maybe Hessians after you. /hostile Rogues and you only make the Rogues hostile.
Also useful for odd cases like Aquila Defense Systems, my unofficial pirate shipbuilder. The Rogues and Mollys are not to shoot at us for RP reasons, but it's not a deal any of their allies know about, so we'll still have issues with the Hackers and Hessians.