I have been to Mexico City, Oaxaca and Patzcuaro carrying tripod and camera bag full of Rolleiflex stuff in the last 6 years and never had any sense of menace or danger. Except being stopped by the police and told to be careful going down one particular street in Mexico City and being stopped by an old lady and warned not to go down another particular street in Patzcuaro. Otherwise I feel safer there than in the US. Same thing in lots of little surrounding villages. Traveled by bus, cab and public transportation.
Dennis