"Over 5,000 people have been killed in Mexico since last year,"
Yes, and most of them druggies and almost all of them in the Northern border area. Mexico is a big country and there is no violence in most coastal areas in the rest of the country. The places I like are a thousand miles away (literally) from all of these problems. But hey, dont go if it makes you nervous.
One thing is good to know though - Regardless about your views about going to Mexico while this is going on, it is a sign that the Mexican government has gotten serious about the narco trade and is trying to do something about it which is a very good thing. Eventually that should lead to a better situation.