Some of you will not like this or disagree with what I am about to say.
Petty crime has bee rising yes, so has it risen in the USA so there is nothing new and calamitous, what is really happening is that the border is now more difficult to breach with drugs and humans, so the narco cartels corporations are diversifying, "la cosa nostra" style raqueteering and extortion is the next good business, the Coca-Cola bottling plant in Chilpansingo, Guerrero has been indefinitely closed, the local narcos wanted protection money, so it is among the different narcos guarding their turf and running out of work "that is running drugs to the border and South Americans", so they have to find a different source of money.
Gringos are not going to get targeted during the day, it is too risky for them unless they have Jeep, those are highly sought after as a status symbol but chop shops love them good money in parts.
There have been some innocent by standers that have gotten caught in the cross fire, all of them in Reynosa, Tamaulipas some in Acapulco and others in Cancun, the petty thief's know that the Mexican's most of the time will not want to get involved with the authorities, on the other hand the gringos will raise on hell of a racquet and the authorities will have to change the case from a number in a statistic to an open case to get the perpetrator, so the thief's do not want that, so far you are all safe.
How to go about your business, have dinner in the more affluent tourist parts of town and have dinner before sundown, do not go bar closing until 2:30 AM that is asking for trouble, things have changed a bit in the last 40 years, the same as in the USA, people forget that there was a massacre in McDonalds in San Ysidro in South San Diego some years ago, there was one today perpetrated supposedly by a naked German, my bet is he was high on meth they tend to get hot and get naked.
Do not drive at night and stay at secure places, boon docking in Mexico is not a good idea, you can probably do it in Baja but even there it is changing, the reason on the uptick in Cancun and Los Cabos are the miles of empty beaches where they can unload the Colombian product, by sea.
Be aware of you surroundings do not do anything stupid or dumb whether you in Canada the United States or Mexico, your life is worth more than any possession you may have with you, even if the leave you stark naked you still have the most valuable possession YOUR LIFE!
There is a saying in Spanish that states:
LA VERDAD NO PECA, PERO INCOMODA
The truth does not commit a sin, but it is uncomfortable
Be smart, be aware and above all be safe.
navegator