FWIW, my sister had a job working with mostly illegal Mexicans in Texas some years ago. She spoke Spanish fluently and said that many, if not even most of them were kind, wonderful people. But this belief is in their DNA.
They have absolutely no guilt or even remorse about crossing the border illegally, staying illegally or milking their American hosts for all they can get because this is how they've been programmed to think.
Thanks for the realtime input.