It was a lethal response to lethal actions plain and simple! A case down in El Paso of Border Agents killing a 15 yeard old Mexican who was part of a group throwing large rocks. Americans are killed in Mexico all the time just ask college students and not to even speak of drug violence that has come over our border!
http://www.comcast.net/articles/news-national/20100608/US.Border.Patrol.Shooting/