to write off a whole country because of a border incident in an area that is known to have problems is just plain ridiculous. That is like saying "I'm not going to the US because they have a high murder rate in Chicago"
Mexico is a big country with lots of people and most of them are very friendly. The USA is a more dangerous place by almost any measure unless, of course, you are in the drug trade since most of the violence in Mexico is aimed at them and not at us tourists.
Over 5,000 people have been killed in Mexico since last year, and that's as many American soldiers that have been killed in Iraq since we've been there.