Comic book heroes thrive on violence.

but: some are satirical
but: McDull does not thrive on violence (Wikipedia contributors (2008) )
but: some just make fun of themselves
- because: eg. Charlie Brown and Snoopy
because: some are neurotic individuals seeking therapeutic redemption through superheroic deeds
because: they are glorified on the silver screen
- because: Americans in general are fixated with the idea of superhuman invincibility
  - because: there's a side of American culture that's very uncomfortable with confrontation unless it has superior power over its enemy (Moore (2008) )
because: they are an expression of a culture of impunity, of being untouchable (Moore (2008) )
because: they are always engaged in a battle between good and evil
- but: the line between good and evil is not as clear-cut as before (Fergus (2008) )
- because: eg. Superman, Spiderman, Batman, the Hulk

Fergus, M. quoted in The Philadelphia Inquirer. "A time for superheroes: Iron Man, Batman, Spiderman-- holy ka-pow, why so many powers out to save the world?" Oct. 23, 2008.

Moore, A. quoted in The Philadelphia Inquirer. "A time for superheroes: Iron Man, Batman, Spiderman-- holy ka-pow, why so many powers out to save the world?" Oct. 23, 2008.

Wikipedia contributors, 'McDull', Wikipedia, The Free Encyclopedia, 10 November 2008, 21:52 UTC, (accessed 30 December 2008). (http://en.wikipedia.org/wiki/Mcdull)