People care more about their party than pr

There is no argument to make in favour of proportional representation. The reason for this is that the fptp voting system protects the left so it is only they who have something to lose from pr but winning arguments are generally anti-left arguments. (So the argument cannot be won... to be left-wing is not a contradiction to adherents of fptp.) Anti-left arguments are generally the winning argument because leftism (often) assumes collectivism and that certain people have something in common with others and should be preferred. Leftism is a kind of bigotry in favour of the group or the country and so it is easy to win arguments against the left by exposing this fact. But with pr we can show that it favours the left but we are dealing with people who are already predisposed to favour the left and so we have not won the argument. It is when people cease to be collectivist that they will share your preference for pr. If someone is left-wing that preference will be stronger than their views on fptp versus pr and so it is a waste of time to talk about pr versus fptp when you could be addressing the bigger issue. If someone doesn't like pr the first step is to find out if they are a collectivist. If people are idiots they will not like pr (perceiving it as a threat to their party). Pr is the means by which we destroy the political parties but if someone is loyal to a party they will not be in favour of pr. And in this case it is better and more productive to discuss their loyalty rather than to discuss the voting system. People's party loyalties are stronger than their loyalty to a particular voting system.