Either he is genuinely too stupid to see that his broader vision is not widely shared outside of his narrow world, or he is just trying to bring down Turnbull deliberately.
or he could be totally genuine in his beliefs and believe he is right. And that it's better to be Right and ineffective government than allow the liberal government to govern in away that he believes is wrong. He could be smart enough see that his vision isn't shared but stubborn enough to try and force his view on his party by whatever means available.