Proportional representation is the opposite of tyranny

It is good if small parties are able to get into government because this means that people are not obligated to vote for large parties. Only being able to vote for large parties is a problem because we are endorsing things we might not otherwise. Pr enables people to vote for small parties and not jeopardise their vote... which is good because this means people can get what they want out of democracy and government. If democracy is good then pr is good because it makes democracy more effective by enabling people to vote for smaller parties. If it is not good to have democracy and better to have unaccountable government (defined by tyranny) then pr is not good. Pr is good if tyranny is not good.