Slavery in this country. Maybe, big maybe but not going there. And only if you take the country as a whole during a certain time period. But not slavery in general. Slavery in general is the extension of majority rule. The rule of the majority makes them strong, the voice of the minority makes them a target.
In any system where you are imposing a standard you are doing so against people's will. And often to the determinant of the minority. While in most cases the majority would not actively be as inflicted as the minority is if they lost. You are placing the buderns of the majority upon the backs of the minority. And you do all of that injustice and you dont actually come out with a better system or result. It would be acceptable if we got good results, but we dont.
Two wolves and a sheep voting on what's for dinner. I like mutton, thankfully so does my fellow wolf. Sorry sheep, we won the vote. Fair is fair. Democracy in action.