First past the post is not a problem for the left

Proportional representation is good for the liberal right because they can vote for the party of their choice and still reject socialism. With pr all votes negatively influence the candidates we did not select... all votes are tactical. Under fptp only a vote for one of the main parties is tactical. Since the left is more comfortable with collectivism and grouping together fptp is less of an obstacle for them. They have no difficulty in voting for the leading party of the left. For liberals and libertarians it is not so easy for them to vote for the mainstream party of the right and so their vote could be wasted. Because the left is less offended by tactical voting fptp favours the left wing.