You really don't want something bad to happen to a tourist, so you focus on the worst-case scenario. It akin to a children and streets; it's easier to tell children to avoid crossing a street and not have to worry, even if statistically it's pretty unlikely an accident would happen.

Moreover, since the news largely focuses on the tragedies, it's easy to get an inflated sense of danger. I know people who live in Culiacán, right in the center of the Sinaloa Cartel. They'll tell me every day in the news someone is dead.

Nonetheless, they live worry-free, peaceful lives. In a city of 1 million, and especially if you're not involved with cartels, even considering the homicide rates are much higher than they should, it's very unlikely something bad will happen to you.