Are you sure there's not a more out of character reason for their stupidity? You mentioned a few reasons why you are the party leader, but not a single one of them was that everyone else voted for you or listens to you. It seems like their stupidity only comes online when you give them a plan they can pointedly ignore. I wonder if they are ignoring the plans because you come up with them and they don't like the fact that you've become the party leader without their input.