“To facilitate this vetting, all applicants for F, M and J non-immigrant visas will be asked to adjust the privacy settings on all their social media profiles to ‘public’”, the official said.
This isn't theoretical. Both China and India, the two countries that supply the most students to the US, prohibit marriage equality. Both have extensive discrimination throughout their societies, both at the government and cultural levels.
I, personally, don't see a problem with creating an ideological test for certain kinds of visa holders or permanent residents. As Karl Popper noted in outlining the paradox of tolerance, unlimited tolerance can lead to the destruction of tolerance itself. I think it's worth exploring ways for the government to prevent enemies of liberalism from entering the country, even if we already face illiberalism at home.
That being said, I think this specific proposal threatens personal privacy far too much to be justified.
People can believe whatever they like as long as they don't become a movement dedicated to murdering those they don't like.
Historically, observably, and objectively, the US right has much more of a history with political murder than the left does.
This isn't some ideological purity test about "liberalism". This is about maintaining a culture that supports a broad spectrum of views in a peaceful way.
When the state itself crosses that line the state itself becomes oppressive, and would-be residents should be asking themselves whether that's the kind of state they want to live in, or visit.