What I'm trying to say is that illegal immigrants just like the Jews are the 'other' the actual group doesn't necessarily overlap with the boogyman. For example trump voters having their partners deported. Yes they wanted to get rid of the illegal immigrants, but that excluded their partners. They were different. The illegal immigrants they were thinking of are the drug smuggling dog eating pedos.
It's reasonable to want to get rid of the drug smuggling pedos, and that's what they think they're doing.
You're trying to inject too much rationality into this. This is the same species that collected beanie babies, that still argue whether the earth is flat, whether 9/11 is a cover-up, whatever meme is popular this week with the kids. Cognitive dissonance is a powerful thing.