Pure democracy is collectivist mob-rule .
Under capitalism no individual, nor any group of individuals, whether they be a minority or a majority, can violate the inalienable rights of any other minority, including the most oppressed minority that has ever existed — the individual.
Capitalism limits the democracy — the majority of the moment — to a useful purpose: the electing of various individuals to various positions of public office. Other then this limited aspect, the power of the majority is severely limited. Capitalism in this sense only supports a limited “democracy”, but not a pure unlimited one.
In the sense, commonly used, that democracy means egalitarianism — the equality of results (wealth), by an unequal protection (violation) of rights — capitalism is entirely opposed to it.