[Daishiman]

Democracies are not a guarantee of civil rights and easily turn into authoritarian and repressive regimes.

[Ajedi32]

Usually only after they stop being democracies. It's rather difficult to repress people who can fire you if they don't like the job you're doing.

But in principle I agree, democracy on its own doesn't guarantee morality. There's such thing as the tyranny of the majority.