We have shown that Islam can rule the world perfectly for 14 centuries, and during this time of Muslim power we did not borrow ideas like democracy from others, so why do we need to learn democracy from them now?
Likewise the leader of any state has to do the same, he has to enforce Shariah firmly, for he will be held in account later in the afterlife if he fails.
Look at the Afghans, during the time of the Soviet invasion. They were among the poorest Muslims in the world, yet they were sustained by their faith in God, and God alone.