My take on this is that this "war" has been coming for a long time.
It's never made sense to me that a group that labels itself as Zoner protectors would go to war with anyone, assuming their RP is to keep Zoners safe it seems that that would be pretty difficult if they were tied down in a shooting war with one group in a particular area.
I'd say give them freelancer ID, it seems to fit.
I also think in RP terms the Corsairs are completly right in attempting to do something in Theta. It's one system from gamma and has been used as a marshaling area (technically under the eyes of the AW) for its enemies for a while.