I mean really why is he still in? Batman is a dangerous, violent, EXTREMELY paranoid, borderline psychopath, who has a "plan" to take down the rest of the JL if need be. Who does that? These are people he claims are his friends. If your best friend told you "By the way, I have a gun on me at all times just in case I have to kill you." Would you want to be around him? If I was in the JL I would have voted him out years ago.
He's also an arrogant asshole. He has a plan to take down the JL, but what gives him the right? Why does he think he's the only person on the planet whose smart or has the moral authority to make that decision? If they don't follow what he believes is the morally righteous pathhe get to kill them? Thats fascism.