Pr is good unless the two main parties are the same

In logic the middle is excluded which means that the truth of something is not ambiguous... there are no grey areas when the truth is revealed. So if the Labour party are bad and something is good for the Labour party (such as fptp) then it cannot be good or even in a state of ambiguity... we know that it is bad. Fptp is either good or bad... and it is bad. The common assumption is that fptp is good for both the Labour party and the Conservative party together but if the Conservative party are the opposition to Labour then fptp cannot be good for them. The Conservatives must either be in opposition to Labour or they are the Labour party themselves. If the Tories are not Labour then fptp is bad for the Conservatives and bad for everyone. If fptp is good for both the Conservatives and Labour (as defenders of fptp assume) then those two parties are the same. If there is a difference between the two parties then pr is preferable.