The guys who are promoting the idea that Mexico still has a legitimate claim to the SW US, such as Armando Navarro, do not represent any serious point of view in either the US or Mexico. Therefor, at one level, to treat those guys as if they were worthy of attention is mistaken.
At the same time, as you notice, these guys are truly evil. If they were serious, then what? Violence? Insurgency? War?
This is one of the several things about the Left that is so evil. They promote ideas that are not serious; anyone who acts upon those ideas brings death and destruction upon themselves and to their victims. In fact, anyone who buys into the victimology winds up stewing in misery, and throwing their lives away for nothing.
As I mentioned earlier, Navarro is a US academic, a leftist professor. He gets paid taxpayer dollars to fill young minds with this bilge.
Nothing to see here, just go on back to sleep.
True, at this point, this is nothing more than a few vocal rabble-rousers playing demogogue politics.
But to underestimate the appeal of their movement among Mexicans would be a mistake. When you combine that with changing demographics that will put Mexicans in a position of majority in Southwestern states in 20 to 30 years or sooner, this is not something we can afford to just dismiss.