Any discussion that is at least slightly explicitly political (as opposed to everything, which is at least implicitly political) is liable to be removed by the mods. It's up to whether they see it and whether it offends their sensibilities in the moment.
They are flagged because they are off topic for HN
Anything hackers may find interesting...
Well, anything YCombinator as startup accelerator finds interesting, and nothing that offends their corporate goals.
Yeah but the bar for politics is extremely high because most threads turn to shit