7. Batman Hates Guns
This plot device was heavily explored in recent comics, as well as by the DC Comics Animated Universe (aka DCAU, Timmverse or Diniverse named after producer Bruce Timm and Paul Dini, respectively). The idea spurns from the fact that young Bruce Wayne watched his parents get gunned down in an alley, and thus gun crimes are the most abhorrent of all to the Batman. However, only the elite Batman fans know that at one point Batman himself used a gun (hey, he already has the belt, why not a holster?) back in October 1939 in a story written by none other than Batman creator Bob Kane. Loaded with silver bullets, Batman used it to exterminate a vampire problem.
Pretty cold to cap a guy in his sleep, don't you think? That's our Batman!