They've made the choice not to --- just like the Nazis decided to follow Hitler and not God, Muslims decided to follow Mohammad into Hell. Many of them pick such a religion because they don't want to question or think for themselves. They are told how to bathe themselves, what to eat, how to clean out their noses, how to beat their wives. They have chosen to give up Free Will, they continue believing in a religion that tells them it's the death penalty if they question or attempt to change religions. They can't see the wrongness in that because they don't want to --- look how many Muslims support the death penalty that was put out on Salmon Rushdie.
I don't believe Muslims HAVE the choice, they have no freedom of religion, no freedom of the press, etc.. Most can't even read. They are brainwashed and the penalty for "heresay" is death in most of their countries, even those we are allied with. I feel great sympathy for them and pray that if anything good comes of all this, that the people will eventually have the freedom to make their own choices, free of persecution.