First of all, most Chinese farmers, like all farmers the world over, never had an education during most of history, and most were still decent, moral human beings. Second of all, poor people do shit rich people don't have to do in order to survive. It was not until wealth inequality increased and traditional social safety nets deteriorated that morality declined. Could a better education have ameliorated this? Certainly, but not in the way you say and not directly, but it would have created earlier conditions for political change and for the protection of individual rights, things that are still happening, but at a slower pace. This generation is still vastly better educated than the last.