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You are allowed to be wrong and happyNobody said you can't. They said the happiness is "decoupled from truth", which isn't ideal if we care about objective health of a society.
Your position seems to imply support for society-level submission to religious dogma. There's no point ignoring actual examples of all these ideas.
Hold an "uncommon belief"? According to you, it's a sign you're wrong. "the world isn't crazy, it's you who's missing something"... and you even say "let people continue being wrong for the sake of being social."
I don't think you meant to express support for strict religious rule and population submission, but that's how I'm reading it.
Your argument supports those who seek submission from the population. You don't require objective truth to play a role in happiness. You have found value in submission that serves to neutralise dissent. Dissent when coming from the few, isn't worth your time. Peg those few dissenters as "probably wrong" and call it a day.