The problem with majority rule is that it's a characteristic of our species to be averse to social change. We tend to be biased against the unknown, so it takes a long time for the majority of society to treat oppressed groups with compassion. The backlash to social change always promotes the idea that the needs of the oppressed contradict the rights of the majority. It's enough to look at the right-wing propaganda anywhere in the world to see this in action.