It wouldn't be so bad if killing Sirius police and Navy vessels didn't give you rep with the GRN and GRP. And yet it seems like everyone and their dog is neutral to the GRN... I have not once seen a Sirius intruder actually getting attacked by our NPCs. A few times they even shoot me while I'm about 200m from the Beuvray... and let it stay white to them. I swear, if they weren't all such crappy pilots that died in two passes I'd have a lot of reports to file...
The Gallic Royal Navy is hostile to any and all House-aligned people, as well as any other foreign legal folk (like the Colonials, who are best treated as a mini-house in the Taus, but I trust that won't come up again). If you want to trade into the cool profits of Gallia, we are more than happy to have Freelancers and Junkers go back and forth, making us look all cute and cuddly and not worth building defenses against. But House Corporation-ID'd traders are going to have some plasma, tachyon, and antimatter related "reactor malfunctions". Council bases are still open to those people, however, they're also trying to convince everyone that the GRN is cute and cuddly. Which is highly ironic.