Why was Madison concerned about the possible violation of individual rights by state governments?

James Madison was concerned about the potential violation of individual rights by state governments because he believed that without a strong central authority, states might infringe upon the rights of their citizens. He feared that the diversity and competing interests among states could lead to the enactment of oppressive laws or the neglect of fundamental rights. This concern motivated him to advocate for the creation of a federal government with checks and balances, ultimately leading to the drafting of the Bill of Rights to protect individual liberties. Madison's commitment to safeguarding personal freedoms was a key aspect of his vision for a balanced and just government.