Mexico doesn’t want its own citizens to come home.
BINGO!
Mexico has a tiered society based upon skin color.
The elite political class is comprised of light-skinned European-descended persons. They possess the absolute control over the country as well as over the lives of Amerindians and the Mestizos with darker skin.
Mestizos– These are the people who do not belong to any non-Mexican heritage or any indigenous culture but rather identify as having heritage and cultural traits similar to European and indigenous traditions. They were further classified in two parts as: Mestizos with lighter skin tones and Mestizos with darker skins.
Amerindians – These are considered as the lowest level of the racial hierarchy in Mexico and are the indigenous descendants making up the majority of the working class in the Mexico. These possess lower rights, power and even low wages. These are more likely to flee the impoverishment of their class and become illegal border crossers we see in America.
It is the elite class that does not want the Amerindians in Mexico. They are pushing these “undesirables” into America through illegal border crossings. If one wants to accuse anyone of racism, it is the elite class in Mexico that participates in a racist economic apartheid.
If we actually sent ALL of their citizens here illegally home, Mexico would collapse. That's why they are shooting off their collective mouths now, because they know that even if we only send them a million or two, it will bring down their government.
Build the wall, send them back, fire a couple of rounds in the air, and voila, their revolution is under way!