Mexico is inexorably becoming a failed state. I've seen a few of those. Things are going to get much worse in our border states. And there is no simple answer, no quick fix.
Hemispherical legalization of marijuana is a novel idea, but it'll never happen. The US alone spends around two billion a year fighting the "evil weed." To no avail.
This gentleman died a hero, but he never should have died in this manner in the first place. RIP.