Actually, I think Liberty Rogues and Gallic Brigands are the only NPC "pirate" factions that are actually just pirates, with no lofty goals to work towards. This has always been one of the things that bothered me about the factions. Though yes, indy pirates with pirate IDs can represent the common "pirates" that we're supposed to see.
And I have to say, LR *are* just pirates.
And please, let's now throw around "wahh wahh wahh lawfuls/unlawfuls are doing this to my unlawful/lawful character and I'm going to whine now!" bit. It only serves to fan the flames. On all my characters, I try to go to that deeper level of RP, but one of the problems is that it's just so hard to find the appropriate opponent to RP with. I mean, there's too many damn zoner traders going around in their whales! My Gaian wants to find Planetform traders to interact with! I'm sure Lane Hackers would want to interact with Ageira transports, etc. And on the other side of things, there's a bunch of pirate or freelancer IDed unlawfuls that go around shooting up stuff, whatever happened to being a factionalized unlawful? Oh, that's right, it gets in the way of MORE PEWPEWING.