To be fair, not all people that are for the wall, are bad people. Some of them are stuck in jobs with stagnant wages, while they watch more and more illegals come in, working for lower wages. They are tired of the same old politicians doing nothing for them, so they follow someone like Trump.
I could understand the angst there, even if I do think it's somewhat misaimed. Though I don't think it justifies politicians preying on it for easy votes.