> The US will ban you from flying if you are politically controversial [1]
The provided source doesn't support this claim. The only part which could even remotely be constructed as support for this claim would be 3 and the anecdata there include "He suspects" and "He thinks" - on the other, that you can end on such a list without knowing the reason (and often without recourse afair) is a real problem, but that's not what you claimed.
So I suppose it's possible that a professor with controversial opinions ended up on a no-fly list for some reason completely unrelated to his politics. Occam's razor, though...
Yes, Occam's razor.
Professors tend to hold controversial opinions. Random people will end up on the no-fly list. Sooner or later, that random person will be a professor with controversial opinions.
DHS does not use social media posts alone to place someone on watch lists, but they are incorporated into predictive assessments. Given two people who are otherwise equivalent, the one with public stated controvsial opinions IS more likely to end up on a no-fly list. By the govt's own admission.
The provided source doesn't support this claim. The only part which could even remotely be constructed as support for this claim would be 3 and the anecdata there include "He suspects" and "He thinks" - on the other, that you can end on such a list without knowing the reason (and often without recourse afair) is a real problem, but that's not what you claimed.