I don't think many here hate the Mexican people. I think what you are hearing is absolute frustration at a border out of control and no relief in sight. I find myself thinking horrible thoughts about how to close the border. It is just frustration, don't read more into than that. I have lived here many years and have seen a friendly border turn into a war zone. I do not think the citizens of another country should look at our country and our citizens as a solution to their problems. It is unfair to our people and if things don't drastically change we will end up in the same boat they are. You can only save a drowning man if you don't get sucked under yourself.
Mexico itself has become a war zone thanks to the drug gangs and a corrupt government and now this war is spreading to the U.S. Things will not get better until the Mexicans overthrow their narco overlords. That is unlikely to happen anytime soon so we must improve our border to isolate us from the narco war to the south.
Then you're either incredibly naive or in denial.