The 1973 Afghan coup de'tat created the conditions for the Soviet invasion of Afghanistan which led to not only the rise of the Taliban, but also for Osama Bin Laden to become a prominent figure in jihadist circles, which allowed for the creation of Al-Qaeda and as a result, 9/11 and the War on Terror.
So, what would need to happen for this coup to not happen? Would the King have to step down voluntarily before a coup happens, etc?