Their existence makes a great argument for the moral superiority of the pursuit of material things. Batman, Star Wars, Lord of the Rings and G.I.Joe do come before God (just like every other earthly thing). Every dollar that goes to Sideshow, or DC, or Marvel, or Lucasfilm, and not to a church is money that has gone to empower true human values, instead of supplicating human values at the feet of a jealous cosmic puppeteer whose only claim to fame is the fact that he has no tolerance for values other than his own (no matter which religion one considers) and that most of mankind's sins have been committed in the name of service to it.
But I agree that they should be ignored, unless someone can figure out how to bait them into committing an arrestable offense. Until protest permits are understood legally as a license to disturb the peace/commit disorderly conduct, and someone puts an end to them, ignoring tools like these (and tools like the G8 summit/Iraqi war protestors, etc.) you are going to have to deal with them ruining your day whenever they feel like doing it to you.