To the topic: After observing some factions around here, official or not, I have noticed that some of them have kind of ... pride, if you will. That said, in most cases it is rather excessive causing enormous amounts of hatred, flame and general unhappiness in all involved factions. Personally, I don't see anything wrong with a bit of pride, but that is as long as it does good, meaning aiming high without actual lust for power and being always the winner.
Given that, if I was a faction leader and if I wanted said faction to have some influence and stability I'd damn make sure that most of the people in it are dedicated for (not obsessed with) its cause. And that might be a reason to kick someone out for playing for the opposing side.
But then again, I have no idea about thoughts of CR/IMG/Outcast leaders and I might have been playing too much of EVE.
Concerning Tau 23 situation, as long as both sides stay in that system the problem cannot be solved and the only solution I can see is creating a new system between 23 and 44 with holes to 31 and 37, moving Cali there and heavily reinforcing defenses in both Tau 23 and the new Tau.
Note: I'm sleepy and I take no responsibility for what I've just wrote or for any reactions to it.
Edit: And yes, this hate Chenzo spoke of. All you need for solving this are strong leaders with sense of fair play and stuff. Internal OORP regulations would help too.