Obrador left his home ,which has a Wall around it BLAH BLAH BLAH
The #1 reason every homeowner in Mexico who can afford to build a wall around their house (quite often topped with broken bottles cemented into place) is that if they can afford to -- they cannot afford not to.
It's been that way for decades.
Enforcing immigration laws -- stopping unauthorized immigration is aimed not only at Mexican citizens, but most all of the rest of the world, too.
Stopping undocumented, illegal entry into the USA will help set the stage for increase of LEGAL, properly documented immigration, in the end becoming the best thing that could happen to the kind of immigrants America may chose to allow.