Most of their signs are anti-American. If they were asking us and displaying the American flag, it might be different. But why in the hell do we want these Mexicans that absolutely do not respect our laws or culture but want to turn America into Mexico. If they want to remain Mexicans, then go the hell back.
They already contributed towards ruining Mexico, So now they're looking for greener pastures to leech off of and ruin.
With these types, it isn't about "escaping Mexico for a better life." It's about flooding the demographic balance enough so in the future they can claim the United States for Mexico. It's not going to stop at the Southwest, folks.
They want to remain Mexicans but hell, Mexico sucks so they want to live here. Thing is they're bringing the culture here. They hate whitey and capitalism, but want all the goodies created by them. Just the people the "organizer in chief" loves.