Have you actually been there or anywhere else in Central/South America? The media usually makes everything seem worse than it actually is. I'm not saying that they don't have problems, but if you respect the locals and don't do anything stupid you're probably going to have an amazing time. And I say this as someone who spent a month traveling around Ecuador by herself.
Broadway Calls and A Wilhelm Scream are just some of the bands that have already toured Mexico, looks like AWS isn't just playing
to 5 kids either. And if nothing else it's an excuse to see a different country so I can't really blame them for wanting to make the trip.