[We just plain cannot trust Muslim countries with vital security functions.]
Do you mean like we can't trust Muslim countries like Saudi Arabia to perpetually provide us with secure bases of military operations? The bottom line is, in this case, a literal "bottom line". If it's in a country's material interest to behave in a certain way, then we can trust them to do so.
[Is that clear enough for you?]
Yes. I read, write and understand English very well.
Your citing Saudi Arabia is, I think, not the best example. The fact that the Saudis have allowed us to establish military bases on their soil is fine and dandy. But remember that those bases are on Saudi soil, not U.S. soil. And it does not give the Saudis close proximity to critical U.S. facilities and defense functions as does this dubious plan to put the UAE in charge of the ports.
Do you think that the hatred that the Muslim world harbors for the Christian world, particularly America, is something that can be bought off ? Do you think that 'material self interest' means squat to a suicide bomber ? Do you think that money means anything to religious fanatics ?
Do you know why al-Qaeda loved Afghanistan so much ? It wasn't just the Taliban government. It was because the sheer poverty and backwardness of the country was to them a paradise of rustic purity and virtue. They don't hate poverty. They hate wealth. Why do you think they tried twice to destroy the Twin Towers ? Because it was a symbol of America's wealth.