Why did Madison believe that a pure democracy was not suitable as a model for a government of the US?

James Madison believed that a pure democracy was unsuitable for the United States because it could lead to the tyranny of the majority, where the rights of minority groups could be easily overlooked or violated. He argued that a republic, with its system of elected representatives and a framework of checks and balances, would better protect individual liberties and prevent the potential chaos and instability that could arise in a direct democracy. Madison emphasized the need for a government that could manage the diverse interests of a large nation and ensure a stable and just society.