The nature of life its such that everyone will have their own definition of moral. The powerful majority forcing their values on the weaker minority will always happen. I wouldn’t reserve that phenomenon to only happening under a democracy.

Democracy I reserve for the governance system whereby we try to convince the minority the wishes of the majority to convey they’d lose in a violent disagreement.

Good in theory but the majority don’t always represent the most powerful, and the participants don’t always know what’s being voted on. Most don’t have the time to understand the existing system of laws made before them and the unintended interactions between new laws.

The US also doesn’t have a true democracy, it’s a republic, which makes an even more convoluted system for which people must navigate to make changes to.