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Discussion against the prevalent groupthink sentiment are considered haram and shunned on HN.

I know it's unfair but it is what it is.

I wish there was some independent vote quality assessment process (a bot working on the HN backend) gently adjusting account standing factor based on their votes on the obviously true/false comments. After a while troll would simply see zero impact of their votes and comments assigned 0 karma at the outset. For not bringing the positive impact to the community.