Proportional representation can only be a good thing

First past the post is an obvious contradiction. We do not have democracy if the government is elected via fptp. With fptp (and as a consequence of Duverger's law) almost always a two-party duopoly will emerge. This is not a good thing in the same way that a monopoly is not a good thing. A duopoly is able to behave as a cartel even if it is not an absolute monopoly... by definition against the wishes of the people. Even if people vote for some government intervention the means by which the government is able to intervene is (more) restricted with pr... with fptp the government is able to intervene with much more freedom. With pr people get the size (and type) of government they want. With fptp people can only choose whether it should get bigger or smaller (there is only one axis of control)... pr provides unlimited means by which to influence the government.