The smartest thing this guy could have done was retreat.
He was out gunned and out manned, yet you want him to throw his life away for drugs.
I expect law enforcement officers, including the Border Patrol, to enforce the law! Now that does not entail giving up your life needlessly - neither does it constitute turning tail!
He could have kept his distance and called in backup with superior firepower to the Mexican Humvee.
Which raises the question - if this is happening on a somewhat regular basis - why wasn't our guy a part of a reinforced patrol in the first place.
Because the INS and Border Patrol are not taking border violations seriously!
And you don't know that the 'Mexicans' were bring in drugs... they have been known to smuggle people....some of whom may have names that are not Hispanic and think a repeat of 9/11 might be a good thing!
Worries me a bit that you might be a real inspector - without the requisite attitude.