Tories don't hate Labour or they would hate fptp

We have no obligation to vote for any political party even if failure to do so means something bad will happen. The duopoly which emerges under fptp means that if we fail to vote Tory Labour will get in so fptp is only tolerable (to Tories who hate Labour) if we have an obligation to vote for them... but we do not. So fptp is not tolerable to Tories who hate (anyone who hates) Labour. Only if we have a tolerance for Labour do we have a tolerance for fptp... those who do not like Labour do not like fptp.