if a Mexican national commits a felony in Mexico and is jailed why doesn't he lose his American tourist visa?

My ex girlfriend stole $2,000.00 from me to get her brother out of a Tijuana jail his bail was higher than that his wife also had to use what cash they had I know the cops are tough but they wont jail anybody unless they actually commit a crime .

his name is Teodulo Santiago Del Angel he's in the Mexican Army stationed in Tijuana Mexico the first time I met him he tried to illegally sell me a pistol to which I said no because I don't like guns and I live on base and didn't want to jeopardize my navy career for something so stupid I don't know what his official charge was but I know it was a felony and since he's offered to sell me an illegal gun I believe that was the charge because he always has extra money to throw around which is very unusual on a monthly salary that's less than $500.00 a month especially when he has 2 kids and a wife to support. How can he be reported to the proper authorities and have his tourist visa revoked?