Really? Call me naive but as a white British man I'd imagine regardless of statistics, you're way more likely to get targeted in Baghdad compared to Mexico. I was looking at doing an Intrepid/Trailfinders tour of Mexico which included a few days in MC (as well as other cities, obviously). Although the girlfriend had voiced concerns I would have thought a lot of the violence there is between cartels/gangs -- compared to somewhere like Baghdad where Islamic extremists will actively target Western people just for funsies.
I can see the point, the thing is it's very different types of crime. In Mexico city as a tourist, there is a high chance of robbery and low level crime, which is something you're very unlikely to experience in Iraq.