Anecdotal from the Mexicans I know that voted for him, I think a lot of people convinced themselves that he was only going to go after the “illegal” by THEIR definition Hispanics; Guatemalans and Venezuelans that are bad at “working hard” and it was going to free up resources for their hard working, attempting access via legal means, family members to enter. I tried to explain why this wouldn’t be the case but it fell upon too many deaf ears. Your anecdotal evidence might vary from mine though!

Least racist republicans