The OP is well aware of which states of Mexico have serious problems and which do not. He is not going to either Michoacan or Guerrero, the states cited in the links posted by the 2 previous fearmongers. The OP's route will be in areas which are probably a lot safer than Modesto, California (near where Louis Le Tour lives), which has an especially high crime rate.

Folks who are afraid are often unable to understand that large countries typically have some places that are best avoided, and other areas which are quite safe. I suppose there are some irrational folks who just cancelled their trip to Sydney, Australia, and are staying home with their curtains closed.