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As a local, I can tell you that this is a sensationalist article and not telling the whole story. Mexico is overall safe for the average person, and even safer for tourists - and the HiveFest venue is an upscale, touristic, very safe zone. Just don't get drunk and return home walking at 4am and you'll be fine, but I guess this is the case for every country nowadays.

I've been in Mexico (Playa del Carmen) for almost 19 months now. Traveled to Acapulco and other places in our area. Unless you don't use common sense (as @anomadsoul stated) or hang with the wrong crowd (the really wrong crowd) you are safer here than in many cities in the US or even Europe.
I've been riding my bicycle home from the city center (6 km) in the middle of the night and even then I've never felt unsafe.