Why? We've had people on this forum advocate nuking Mexico City. (I assume they are serious from their other posts.)
I don't think we have to worry about that. Hell, the last time we went to war with them, it took the forces like six days to get there, and then only four days to totally seize control.
If we were to roll into Mexico tomorrow, most would see us as liberators.
Frankly, I'm getting a bit tired of all the petty dictator sh*t that's been going on down there.