If you really wanted to end the crime in Mexico reevaluating prohibition would be a good start.
[1]http://www.stratfor.com/weekly/20110209-mexicos-gun-supply-a... [2] http://www.factcheck.org/2009/04/counting-mexicos-guns/ [3]http://www.foxnews.com/politics/2009/04/02/myth-percent-smal...