If someone tries to order you around cause they're official, laugh and ignore them. But if they're acting in roleplay, and saying they're gonna shoot you if you don't listen to them, then you better well be expecting roleplaying concequences if you take a step out of line.
Don't come in here crying to mommy because someone roleplayed their character in-game. That's even more lame than Faction Rights, imo.
It's a roleplaying server, every action has a consequence. Stop always thinking rules rules rules and think about something logically for once.
The Molly's made a peace treaty with the BMM. Now, granted that only applies to the Molly Republic and not Molly's as a whole, in order to keep on peaceful terms with the BMM, the Molly's are going to do everything to protect that agreement.
You know what that means? When another Molly goes and attacks a BMM, they're going to distance themselves from that Molly, and even try to kill him to protect their agreement.
Don't like it? Kill BMM where the Molly Republic can't see you. If they try to FR5 you for that, then call BS.