We've learned enough neuroscience to know that humans make predictable systemic errors in judgement. This is when pursuing their own preferences, not someone else's preferences.

This has real effects that harm other people. Do what you want to yourself. The problem is when you harm others due to your own ignorance or avoidable biases.

None of the big bad movements you mention were genuinely trying to make humans into better thinkers. In fact, they all relied on humans not being such great thinkers.