Outcasts are not Pirates. Corsairs are, yes, but it is a fallacy to expect Outcasts to balance Corsairs in that sense. Corsairs are pirates, because their entire culture is based upon bringing supplies they desperately need back to Crete: if you read their rumors, their first space vessel was a crashed Bee-One (I think) that they stole from the starving crew. Outcasts are not pirates at all, rather, a lost group. They have lived in hiding for hundreds of years, known mostly as a rumor, as something only partly human. Their networks are smuggling networks, and that is where there true power lies. Outcasts do not need steal anything, they are merchants. I'm not saying that there aren't outcasts who man a pirate vessel to produce their income, but that group falls under a generic pirate ID with an outcast Tag...They've left the traditional outcast economic structure, and set off on their own as pirates to make their fortune: The Corsairs are a pirate nation, the Outcasts are a culture of plantations and merchants.
As for Rheinland groups giving up, and becoming pirates, I cannot say I have any evidence in front of me, nor do I know Rheinland particularly well, but I hear this argument applied to all the other groups as well, and I think it stems from people's RP: you cannot under the current rules RP a gaian as a terrorist, so you say that you're gaian is a pirate to gain funds for the terrorists. the assumtion, then, is that Gaians are pirates, which is simply false, and a manifestation of the restrictions of the PC rule system altering how you view the group.
Disco has 2 groups: Pirates and lawfuls. The distinct and glaring problem with that statement, is that Lawful is a n umbrella term for anything not illegal, and yet Pirate is only a small facet of illegal, and so, there is no space for any other sort of criminal behavior.