> It's amazing to me that the fact of them doing it isn't well-known (there is plenty of research and evidence) and assumed, but still a question even on HN. Bring it up to most people and they will ostracize/ridicule you - an odd response which I can't explain well, given the evidence, likelihood, and very serious consequences which those same people are unhappy with.

an explanation would be that these voices doing the ostracizing/ridiculing [anyone who tries to increase awareness of astroturf] are also astroturf. because astroturf is only effective while people are unaware of it. it also seems compatible with the shutdown of research you mention.