These are the same people that were willing to let their grandparents die so they could eat at Arby's again without a mask

Yes. If DHS can barge in, say your visa was revoked, be told you have a green card, say it's revoked too, and then disappear you so that neither your lawyer nor your family can find you, then all the guardrails are gone. There is no policy, practice, or law protecting anyone.