The list of interventions to help counter Cognitive Biases

Is correcting bias at scale possible?

Is Rationalist Self-Improvement Real? - LessWrong

Seems like on the side of yes is: Jacob Falkovich, Eliezer Yudkovsky, CFAR. On the side of no is: Kahneman, Scott Alexander.

Why is it very difficult?

Improving the quality of debate, shifting people's mindsets from transmission to collaborative truth-seeking, is a painful process. It has to be done one person at a time, it only works on people who are already almost ready for it, and you will pick up far fewer warm bodies per hour of work than with any of the other methods. But in an otherwise-random world, even a little purposeful action can make a difference. Convincing 2% of people would have flipped three of the last four US presidential elections. And this is a capacity to win-for-reasons-other-than- coincidence that you can't build any other way.