I used to hitchhike in Mexico in the 70s.
I’m in Mexico all the time- you can be in the wrong place at the wrong time in any city on Earf. Think your safe in Philadelphia or Atlanta or New York? Hell, you can freeze to death in Billings if you break down during a blizzard
Some Australians I knew visited Mexico even in the late 80-90s, and liked it as a slow paced, budget place where one could live for a while, study Spanish, etc. Now, there are heartbreaking stories like this one:
http://www.abc.net.au/news/2015-12-19/mexico-gives-surfers27-bodies-to-australian-consulate/7043438