It's odd that everyone knows how to stop this but no one is willing to do it.
Signs left near the bodies declared the pair, both apparently in their early 20s, were killed for posting denouncements of drug cartel activities on a social network. "This is going to happen to all of those posting funny things on the Internet," one sign said. "You better (expletive) pay attention. I'm about to get you."[cnn.com]