Cartoonist Ted Rall:

Scholars and analysts of the form have tried to articulate exactly what it is about comics that make them so effective at drawing an emotional response, but I think it’s the fact that such a deceptively simple art form can pack such a wallop. Particularly in the political cartoon format, nothing more than workaday artistic chops and a few snide sentences can be enough to cause a reader to question his long-held political beliefs, national loyalties, even his faith in God.

That drives some people nuts.

Hell, some people get all huffy over Some E-cards.