On point 1, Dahlia Lithwick (one of my favorite Supreme Court reporters) recently explained the legal theory of causality
prosecutors are trying to use.
On point 2, I get the feeling that Moussaoui is less trying to act stupid than trying to make a point about the U.S. legal system. He doesn't care whether he lives or dies, but is more interested in pointing up what a sham the whole thing is. Something like (what I remember learning about) the Chicago Seven trial