First Past The Post is good for prejudice

Proportional Representation helps to expose false assumptions because it gives the voter the option to vote for another party that is free of prejudice. If the two main parties share a prejudice, of some kind, then those that are threatened have little option. With a proportional system, people can vote for a party that fosters only prejudices common with the voter.

For example, who does the person with perfect teeth vote for if the leading parties are (both) prejudiced against perfect teeth? Ideally, they would have the option to vote for a party without the prejudice.

Proportional Representation helps to eliminate the prejudice of the main parties.