Within the context of the pie-in-the-sky subject we're discussing, calling for citations seems kind of pointless. We're all just speculating and talking about what-ifs.

I suppose my main concern is that if learned prejudices (against race, religion, ideology, age, economic status, etc.) cannot be eliminated by regenerating brain matter, then a potentially fatal error could arise for society since some prejudices can be virtually insurmountable for many humans. Such an error is often solved naturally when the leaders of the previous age die out.

Just like when a computer system has become corrupted or broken, turning it off and on again can be the most simple and effective solution, so can death and rebirth be an effective solution for when our collective mental processes become corrupted.