Final answer:
Plato's concern about democracy was that it could lead to a 'tyranny of the majority,' detracting from self-criticism and the pursuit of the common good.
Step-by-step explanation:
The ancient Greek philosopher Plato had several concerns about democracy. He was critical of it for promoting what he saw as a 'tyranny of the majority,' where the average citizens, seen as a mob, constituted a majority and believed themselves to be experts, thereby sidelining the knowledgeable and virtuous. Plato argued that this majority could decide matters without proper knowledge or virtue, potentially neglecting the good of the whole in favor of the interests of the majority. Hence, Plato's concern revolved around the idea that democracy tends to neglect self-criticism and self-improvement as the mob believes each individual is correct, deciding everything through voting rather than adhering to absolute standards of the good or virtuous.