SSO are lawful bounty hunters, aren't they? They can't go attacking the Liberty government. (Edit: Er, 'duh' moment for me, ignore that...)
Okay, I'm a little biased (I never liked the Corsair/Order alliance, I just don't see the Order assisting the Corsairs in their pirating), but I'm not fond of the idea. If the Order goes attacking Liberty, it'll just reinforce the propaganda that the government spreads to the population, which causes civilian support of the Order to drop.
And do the Corsairs actually have any presence in Liberty?