I don't think it's fair to characterise all "comic book" films as being immature, although there's a lot of shallow super-hero films being pumped out of Hollywood these days. Maybe if more people in the U.S. were familiar with "V For Vendetta" (despite Alan Moore's loathing for that film) then their attitude towards government might well be different.

(Trying to think of another good example and the Watchmen series tackled racism head-on, also Persepolis is a great animation covering the Iranian revolution)