The Founders knew this and assiduously opposed democracy. Fifty percent plus one is no magic number that transforms a wrong action into a right action. Majority vote can be a useful tool for choosing political leaders, but majority opinion or a majority vote does not constitute a validation of an idea. Truth is not determiend by reference to any show of hands. Whim is still whim, whether it be the subjective whim of an individual or the subjective whim of any group, including the majority of the moment.
Truth is independent of whim.
Progress toward being civilized depends on the separation of Force from Whim. The wider the range of activities covered by the market, the fewer are the issues on which explicitly political decisions are required and hence on which it is necessary to achieve agreement. In turn, the fewer the issues on which agreement is necessary, the greater is the likelihood of getting agreement while maintaining a free society. In practice, we can afford neither the time nor the effort that would be required to achieve complete unanimity on every issue. We must perforce accept something less.