The key thing to identify in this type of argument is the role of liberal ideology in obfuscating power relations. Liberals frame this issue as a moral one, i.e. that it is immoral to have a border patrol that repels immigrants with the (sometimes realized) threat of force. That's not what it is. It's one of power relations. Letting all of these immigrants in politically, socially, and economically disempowers White Americans. We should therefore restrict immigration because it's in our interest to do so.