First past the post subsidises (political) aggression

Tactical voting is oppressive because it involves blocking the opposition party as opposed to simply voting for the preferred choice. There is an element of voting in response to the behaviour of others with tactical voting which is not present in a (liberal) proportional system. With a liberal democracy people can just vote for the party of their choice without consideration to how others will vote. This is a better system because it means (whilst voters are protected) people who seek to be aggressive are not subsidised by the system. First-past-the-post creates an artificial war between the left and the right which means that people who find this behaviour acceptable are subsidised by the system. A liberal system would not subsidise political aggression as fptp does.