They don't understand FPTP. I used to assume that under FPTP More votes beats Less votes the idiots will go OK, we lost. But it became apparent that instead they go "If the person I voted for doesn't win then it's rigged" and so it doesn't matter what system we use. "We won" is the only outcome they believe is possible so since it won't matter and any other outcome will be considered "cheating", we should use a better system to pick actual outcomes.