Cracking down on legal immigrants, skilled immigrants makes no sense. That’s what built America. Cracking down on illegal immigration makes plenty of sense. I hope the administration can see the difference.
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It makes sense when thy engage in political activism or become dissidents. Just because they're skilled doesn't mean they can't be legally causing troubles at the same time.
No country tolerates foreigners moving in and acting against the country that took them in. Well, maybe Germany does.
When you emigrate somewhere on a visa, you're a guest in the country who's tolerated as long as you follow the rules and contribute to society, the moment you start causing trouble with protests or become a nuisance, you're out. Simple.
The moment you try to swing a punch against the government that gave you that visa, then that contract is void, and you're out.
I don't see how this is an issue. Are you OK with foreigners coming into your country and starting to go against your democratically elected government(in principle, not just the orange man specifically)? I don't know anyone who wants that. Let citizens deal with their elected government, you can too once you become a citizen, if you want.
Whether visa holders have such right depends on the countries however; I don't believe France has such restrictions (https://www.service-public.fr/particuliers/vosdroits/F2190 does not mention "political activities" as a valid motive for refusing entry). I think some other countries do restrict political activities for non-citizens.