The wall is like a chastity belt to keep America from being penetrated/colonized by dark skinned immigrants. It's okay when Anglos move in on another land and rob it blind, exterminate the inhabitants, and take it over like it belongs to them. But don't let anybody else come in to their colonized territory and try to fit in and contribute what they know, without trying to kill anybody, and being willing to stay the economic underclass until they've become enculturated and then remain at best second class citizens. Anglos can enter a place and do what they want, but don't you try to enter and make it your place, too. Settler colonialist Anglos can rape another country. But they deny entry to those who love America without having seen her on the inside.
No level of physical security will make us safe from people who hate us. The reason people hate us is because we don't like them even though they loved us. We have to capture the moral high ground. We ought to want to be the nation that everyone loves and nobody wants to destroy because we offer hope for the oppressed and the best way of life on the planet. The number of people who enter America because they want to become American far outweighs the haters. To arbitrarily refuse people asylum makes us seem petty, selfish and afraid.