There have been multiple incidents involving norte americano turistas in Acapulco just this year. Mexico City has been a cesspool for decades. Back when I often traveled for work, I can recall businessmen on the way to or from Mexico City telling me their companies always arranged for them to be met at the airport by ARMED security guards, driven directly to the hotel, and then transferred between the hotl and the office every day by armed guards.
My wife's cousin, from another Latin American country, is a professor in Mexico City. He recently sold his condo in a gated, guarded complex and moved into a newer, more heavily guarded and fortified condo because he didn't consider the old one safe.
I don't think even Baja California is safe for tourists any more.