I feel like you're missing a core part of the joke. It is not just illegal immigrants getting deported so this reads more to me like "you can't target everyone without broad consequences" and uses food as an example for comedic effect.

It implies that everybody that is Latin or Hispanic in America is here illegally, because there would be nobody to make tacos if they were all deported.

Actually, you're the racist one implying all Hispanics are Mexicans.