To hear people talk, Mexico is a hotbed of death and wonton murder. In fact, if you exclude the violence between cartels, you might find that you are pretty safe. A few statistics can be found here:
I’m not saying that you’ll be 100% safe – no one ever is. But contrast the statistics against other countries than Mexico. Heck, even contrast it against cities in the U.S. I think you’ll find that no one is out to get you in Mexico.