Plausible scenario: Ignorant person or small group converts to New Atheism and misinterprets the mockery and ridicule of Christians and Muslims as endorsement for actions of greater magnitude than mockery and ridicule targeting Christians and Muslims. Ignorant person then bombs a church in an attempt to impress New Atheists or to demonstrate his zealousness for the cause.
Here's another scenario, just as plausible as Grim's. Schizophrenic reads a coded message into this picture. He wishes to impress the shape-shifting lizard people who are secretly ruling the world, so he decides to dump 1,000 tons of fertilizer into the lobby of WKRP in Cincinnati. Clearly, lolcats is acting terribly irresponsibly in posting these sorts of pictures. Who knows what might happen!?