Stalin and Hitler did not suffer from lack of clarity. They knew exactly what they were doing, knew why they were doing it, and were glad of the outcome.

I disagree. They managed to convince themselves that the people they were killing weren't really people.

Helping people to open their eyes and see human suffering, raising children to be compassionate, will do far more to get rid of the Hitlers and Castros than logic and writing classes.

Helping people open their eyes means making them stop lying to themselves. People lying to themselves is one of the largest causes of bias. That is a very good example of why overcoming bias is important.