So it turns out that we don't have to feel guilty about loving those super-violent action movies anymore, as research shows they may actually prevent, rather than encourage, real-world violence. 
Read it here, in Foreign Policy:  "violent movies deter almost 1,000 assaults on an average weekend in the United States".

Good news for me, since my romantic Valentines Day viewing was Punisher: War Zone, and I wasn't planning on going on a killing spree anytime soon...