A racist IDEA breeds even more racism, especially if spouted by some politician (exhibit A: Donald Trump). People who aren't affected by such a policy (like white men) get to go about their day, completely carefree about the consequences of what would happen if such a policy were to take effect. And even if it doesn't take effect, they aren't subject to the microaggressions of a policy out there being debated and discussed.
So like I said before: people who this policy doesn't affect (white men) seem to be simply fine with the discussion being had, because it doesn't affect them in any way, shape, or form.
The racist idea of reviewing a policy with regard to constitutionality?