Liberals do not fear proportionality

Proportional representation is not damaging to liberals. Tactical voting is the kind of voting whereby people tolerate one form of government tyranny to avoid another. This means that (perhaps) liberals will tolerate some form of social authoritarianism to avoid economic authoritarianism or vice versa. If a political party is in no way authoritarian then it will have nothing to fear from pr only authoritarians benefit from tactical voting (votes which under pr would go elsewhere). Liberals are trapped under fptp into voting for some form of authoritarianism to avoid another... if they vote tactically and do not waste their vote. If pr is damaging to a political party in receipt of tactical votes this demonstrates that they are not liberals. Liberals do not receive tactical votes because they are not offensive (authoritarian) to anyone... and so they would have nothing to fear from pr. Only those parties which receive tactical votes would have something to fear from pr.