Answered several times already. It's not against the rules to take a house military capital ship anywhere (some other IDs have restrictions, the house military IDs don't).
They are asking you to show some restraint and try to act like you're on an RP server, where inRP there would be a lot of problems with trying to take a battlegroup deep behind enemy lines (it would be noticed, defense forces mobilized, etc). Just no. If you want fleet warfare wait for the other fleet to login.
![[Image: smuggler-threat-0-1.jpg]](http://i183.photobucket.com/albums/x57/UrsusMorologus/Freelancer%20Discovery/smuggler-threat-0-1.jpg)