12 heroes...

Superman - classic hero; he is an american icon in such a way that even non-fans of comics are aware of him. He was created as a representation of the might of America and has since been altered to represent a force for utilitarian ultimate good. Also he is non-violent - perhaps his near invulnerability itself is a deterrent.

Bruce Willis - I mean John McClane. Not the supercop that destroyed a helicopter with a cop car, but the unwitting hero just trying to get back together with his ex wife and caught up in an attempted robbery. John is not a superhero - just what any good ol' fashioned american would've done in that situation. Plus he swears all over the place which is always a bonus

Actually I'm going to retire after BW - he's so awesome he's going to win.