Ooops, there's an eye witness to the pants theft:
http://www.markinmexico.blogspot.com/
I guess even bloody, urine & fecal stained pants have value.
I have about as much sympathy for Brad Will as I did for Rachael Corrie. Which is to say, none. His role there was to create propaganda for the terrorist left in Mexico. He got about what he deserved.
A common occurrence in many third world countries. When there is a bad traffic accident for instance, people come running. They come not to assist the injured people but to loot and steal anything they can get their hands on while the victims are disabled.