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The main answer is "minorities". Look at the American South during the Jim Crow era.

Minorities need protection from majorities in democracies. And not just racial, religious or ethnic minorities. Everyone is a minority in multiple ways.

You have hobbies, beliefs, goals and connections that the majority in your country doesn't have. And they are all at risk under a democracy. This is why we don't have a "pure" democracy. This is why the Founders put many anti-democratic features in the US Constitution.

Every right you enjoy is a point where society drew a line and said "this will not be subject to a vote".