I knew just reading the title of this thread that I was going to disagree enough to post. Damnit...
But then suddenly Aria and I am left feeling fulfilled. Well mostly, two other things I wanted to bring up, I thought some of the PF suggested that the majority of the "pirate" factions received AID/support from at least one, if not more, of the four empires?
Stands to reason that Amarr would help the Angels a bit since they keep at least part of the Minmatar fleet busy fighting them, Gallente help the Gurista's, for the same reason that the Caldari would help the Serpentis. Think of it a little like the US/UK/others sending aid to "freedom fighters" in other countries, in order to help them against foe supported incumbent governments or vice versa. Lots of War's by proxy out there. Not sure how true that is?
Also these Pirate factions seem to have a bit more of a corporate structure then has been given them credit for, with singular "leaders" of some kind or another, it would stand to reason, as with current day gangs and mafia, that the better organized groups would eliminate the more disorganized groups in pretty short order, or, just as likely, absorb them as well. Maybe less structured than say, the Minmatar Navy, but still overall organized in a way that makes them efficient and productive. (nice post by Victoria that covers a bit of this well, ofc posted while I was writing this)
Seri; I'm not sure it's right to say "The pirate factions were not born from civilizations." I would say that while their population doesn't seem to come from just planets, that they are still originating from one of the civilizations(empires) or another. It's a truth that people need places to live, and be that in a space station or on a planet. If people face persecution in the empires, they would likely move out to unknown space to be with people who believed or acted as they did. While it would likely be very wild-west out there, and rough living, I have a hard time thinking that it would be completely without saving graces that would lure more people out there.
Leaders of pirate corps might live a million times better than their "subjects" you can hardly expect that if they treated their people like garbage, ie no medical care, no money spent on infrastructure, that new recruits would continue to join their ranks. "That place is horrible, and disease ridden, and people are dying all the time, hardly enough people left alive to create a living." doesn't sound to me like a place people would desire to move to or live in, they would instead be more willing to follow a leader who might still be a dictator but has at least some regard for the people.