An immigrant who has followed due process is equivalent to a homeless person who has convinced the property owner to willingly let the homeless person stay in the property owner's living room. The property owner is allowed to change their mind about the arrangement at any point, unless and until the person obtains part ownership of the property (citizenship).

"due process" means in concordance with the law. And the law is drafted and implemented by our elected politicians. As a sovereign country, we're allowed to change our laws and our policies.

The homeless person thought experiment is meant to illustrate the existence of tradeoffs. "The cruelty is the point" is essentially rhetoric meant to demonize political opponents, and sweep under the rug the existence of tradeoffs and differences of opinion.

If immigration is such a good idea, people ought to be able to defend it on the merits, instead of pearl-clutching and playing dishonest rhetorical games.

I'm not exactly sure what is so racist or xenophobic about my thought experiment. Homeless people are people too. I'm tempted to pearl-clutch just like you, and accuse you of denying their humanity. Want me to do it?