Please "remember that the community is divided on divisive topics and that the person disagreeing with you is probably not a spy, but just someone who disagrees with you." [1]

Also, specifically about astroturfing: "[T]he overwhelming majority of the insinuations and accusations [of astroturfing] that people come up with about it lead to precisely nothing when we investigate. It's like flipping a coin and having it come up tails a thousand times in a row: you start to look for simpler explanations, and there are clear, simple explanations for why this might be." [2]

[1] https://news.ycombinator.com/item?id=23835613

[2] https://news.ycombinator.com/item?id=23837456