Freedom of one ends where freedom of others begin. But as territories of freedoms overlap clashes are bound to happen and conflicts arise. That's how it goes, and this place is no different to any other, we are still the same.
Rules may not cover all situations but neither they need to.
Can a person buy a capital ship? - Yes.
Can a person bought capital ship roleplay? - Yes.
Can a person bought capital ship being declared rogue utilizing roleplay? - Yes.
Say a person gets declared rogue by faction(s) out there. He may not like it, fine, but why should say a faction sit and enjoy him doing whatever he desires? There are two sides of the coin.
Actions and consequences. So comes responsibility. It isn't automatically coming in package with ship, be it fighter or battleship, doesn't matter. Is it much to ask for responsibility these days?
Roleplay will always be arbitrary due to it's complexity and nature. Rules cover game mechanics for most of the part which are program logic and not question of interpretations.