6. You're Not Bulletproof?
We touched upon this before, but Batman isn't bulletproof: he wears Kevlar like mere mortals and this leads to bigger issues. The other JL members will be concerned with aliens, monsters, robots, and super villains - all of whom have far more dangerous weapons than a Smith and Wesson any local bank robber can wield. Iron Man has a suit that keeps him safe from most artillery and has various weapons in it as well, which basically makes him a superhero. Batman has a costume that barely shields him from knife attacks and gun shots; anything with more firepower than a shotgun is likely to kill Batman on the spot. "Oh, but Batman is like a ninja and he never gets shot; he uses his intellect and his gadgetry to defeat all villains." Yes, I agree that Batman could hold more than his own when fighting, but probability is against him in these cases because the same villain trying to kill Superman or the Flash is far better equipped to kill Batman than Batman's enemies.