Wat Tyler and his associates were ordinary soldiers: they did not know how to command an army or make political decisions. Therefore, King Richard II easily deceived the rebels. However, after that, the king had to somewhat alleviate the situation of the peasants, since the Hundred Years War was still going on and the peasant archers were needed.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.