The left do well because of first past the post

If fptp is not a problem the left would not be so successful under this system. Parties of the left generally do very well under fptp despite many (even most) voters rejecting communism and coercion. The reason for this is that fptp is vulnerable to social authoritarianism on the right which makes voting for the party of the left the only viable option for many people. The fact of the success of the left under fptp demonstrates that it is a threat to liberty. The success of the left is largely caused by fptp... without fptp most countries would be broadly liberal and anti-totalitarian.