The problem is that they already ask you to list all social media profiles, so if you had a "public" account that's only unobjectionable posts, and an "alt" account where you post your political activism posts, you either have to disclose the alt as well, or you're committing a felony by lying on a form.
"Hostile attitudes towards our citizens, culture, government, institutions, or founding principles" all apply to Trumpists (of which there seem to be an uncanny number of non-citizens), but something tells me this is more Orwellian powertalk rather than honestly stated policy.