When I recently posted replies to an HN thread that the Internet had been originally created by DARPA, and that the current controllers had no interest in free speech, e.g. Twitter and Facebook, my posts were immediately flagged. Since both facts are obvious and freely available, my posts were flagged because they contained ideas that either the HN moderators did not like, or did not want anyone to consider, or both.
Looks like HN is tending toward Slashdot's heavy censorship program. The golden days of CmdrTaco are over. That program has ruined open expression at Slashdot and it now reads like bald PR and advertising, which is why I don't bother with it anymore.
Too bad for Slashdot, and too bad for HN.