How stupid can Muslims be?

How stupid can Muslims be?

You know, it’s self defeating for the Muslim hordes to try to impose Sharia on the Western world because once Islam is imposed and the non-Muslims become dhimmis, there will be no more thriving Western economies for the Islamic invaders to leech off of.  There will be no more international trade as we know it so those majority Muslim nations will have no more thriving Western trading partners, leaving only incompetent Muslim regimes.  If the Islamists succeed in imposing Sharia on Western society we will collapse under the weight of 1,400 years of Islamic barbarism and so throw all of humanity back into the dark ages of ignorance and pestilence.