Because he sure can try. If we've learned anything, it's that even though he never became an official member and was only a part-time helper, he was considered one and them and they certainly wouldn't want to hurt him or misuse their powers against him unless it's wa real life of death situation. Take J'onn talking to Batman and Batman suddenly standing up and declaring he's taking the Javelin, unless of course "you" (J'onn) instends to stop "me"; J'onn pauses for a second and lowers his head, "No."
Or how he makes it a point to not only know everything's secret identity, but their weaknesses, hence carrying around kryptonite just in case...
You never quite can predict Batman, even the Flash and Wonder Woman (or maybe it was Hawk Girl) are a little creeped out by him. If he needed to, Batman would use their weaknesses agaisnt them, divide, and probably damn near concur all of them.
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The New Number 2: "Are you going to run?"
Number 6: "Like blazes. First chance I get."
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