This is a gross violation of some of our most sacred principles.
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Historically visas could and were denied for completely arbitrary reasons.
The right to free speech. Even in its restrictive First Amendment form.
some people only consider their in-groups as worthy of having rights.
others consider all human beings as worthy of having rights.
you see that schism in play everyday almost everywhere. i fear it is not a resolvable tension (without some kind of mass severe brainwashing). it is a core beliefs kind of thing.
The assumption of discrimination is therefore baked in to every national project -- there are people who wish to participate in the nation but are barred from doing so. It's uncomfortable for many people to consider this, because it runs counter to the idea that their nations are welcoming places, but it's important to remember this discrimination occurs (even if you think it's a good idea.)