[dang]

> The problem comes to distinguishing genuinely held beliefs from subversive comments designed to manipulate the HN audience

How do you propose to do that? Clearly one must look for evidence. When evidence shows such abuse, we ban the account. Far more often, though (and I'm understating things when I put it that way), evidence shows the opposite: the user was expressing their genuinely held beliefs. Should others be allowed to denounce them as astroturfers, shills, or spies, based on nothing but how strongly they disagree? On HN the answer is no. That follows from the values of this site, and we have a rule in https://news.ycombinator.com/newsguidelines.html saying so.