I disagree with Mr. Brooks assumption that Islamists (all Islamists) lack the mental prowess to govern. His assumption is too ridiculous to even counter.
However, I do believe Islam is a ridilcuous structure to draw from in terms of governing, laws, justice and matters of war and peace. A person's religion or lack there of should have no relevance when it comes to governing. Building roads and getting the trains to run on time, etc has nothing to do with Allah. Allah is irrelevant.
So when Egypt elected a hyper religious group to run thier government, they elected a group of people using the wrong the framework to run a democracy. I don't think this means Islamists are too stupid to run a government but I believe Islam in not a credible intellectual framework from which to build a functioning liberal democracy. It would be the equivilent of America electing a party called "The Christian Brotherhood" to run our nation. They would do a horrible job because the New Testament is not designed to be a framework for a 21st century western democracy.
America works because our nation was founded on the principles of reason and fairness. We are governed by an essentially secular constition, not Judeo/Christian values. Our reliance on reason, logic, equality, opportunity,etc has very little to do with any religious brand. America works because our founders rejected The Church as a starting point for government. Reason, facts, evidence, equality...these are the guiding priciniples set forth by our founders. Islam as a philosophy/religion implicity and explicitly rejects reason, facts and equality and instead relies on faith, belief and compliance to absurd religious laws and traditions. These goofy beliefs have no place in a modern democracy.
So while I disagree with Brooks that Islamists lack the mental capacity to govern, I do believe a political party dedicated to using The Koran as a blueprint for governing is destined to fail...and fail The Muslim Brotherhood did.