Best way I heard why this is dangerous to accept, against anyone.
"when you gamble with others liberty, you are also gambling with your own"
This is why personally I'm against any racism and oppression regardless of the target because once you normalize it against one group, the next step to the next group is very easy for society to accept. Regardless of how I feel about some members of a particular group. Also it's a simple rule to follow without having to care about exceptions. If everyone is granted basic liberty and human rights, it works out for you better in the end.
Anyone who tries to normalize this being done to "tethers" or immigrants is leading you down a bad path that will hurt you eventually. For me, it's not about caping or "muling" for other groups. It's about my self interest even if it's not specifically targeting me now. Because it's easy to see how these things can spread if not cut off at the root. Don't even let it catch root as a general principle.
First they came for the communists and socialists, and I did not speak out—
Because I was neither a communist or socialist.
After that, they came for the social democrats and I didn’t speak out-because I wasn’t a social democrat .
Then they came for the trade unionists, and I did not speak out—
Because I was not a trade unionist.
Then they came for the Jews, and I did not speak out—
Because I was not a Jew.
Then after they got everyone out, they finally came for me—and there was no one left to speak for me.“ -German Pastor Martin Niemoller, famous and dedicated anti-nazi activist
« injustice anywhere is a threat to justice everywhere » -Martin Luther King