The structure is such that people elect representatives and those representatives sometimes appoint other people to roles because it's not feasible for people to elect 10's or 100's of thousands of public employees with decision and regulatory making power.
Also, all of these people are still humans. Meaning that they have their own closely held beliefs. If you are honestly expecting non-elected officials to violate their own beliefs based on public feedback simply because "majority rules", you aren't living in reality. That virtually never happens. When it does happen, it usually happens on issues that are not hot-button issues and those being hounded by the public don't have a strong opinion so they are willing to switch sides if necessary.
And the US is not and has never been a majority rule democracy. It's a constitutional republic and that's a critical difference. Part of that structure is ensuring that in some cases (like the electoral college), the majority don't get to make the rules simply because they decided to band together or live close to each other. The electoral college exists precisely for the situation the US is currently in - where the more liberal areas are all clustered in relatively small, high density areas. They now account for more than 50% of the population but far less in the electoral college because the system was built to prevent that density issue where these small areas by land mass could force feed laws upon the rest of the country, enabling those areas to effectively have control over money and resources which they otherwise would not.