The assumption you may speak for the majority by sampling a small polarized set of data is interesting, but irrational.
it's human nature, when some people have made lots on bitcoin the people who haven't get a crab mentality. i doubt it's a conspiracy
Cryptocurrencies are technically amazing, and yet they fall short of actually solving any problem.
But I think the real reason the threads are low quality is a lot more disappointing. There are a lot of people who (often they aren't even HN regulars) have heavy vested interests in cryptocurrency, in a certain philosophy, in a certain coin, and so they brigade to protect their interests and to steer the ideas of the public in their preferred direction. So people will speak up even if they know it's not really their area of expertise