SpoilerHe protected the **** out of Brody at times. He wanted Carrie blown up because she is good at the job and he fears her. Thats why he either wanted her in that higher position(keep your enemies close) or completely gone. He gave the go ahead to shoot Nazir but, he knew damn well someone would warn him, likely Brody. Also, he wouldnt have been horribly upset if Nazir had been killed back then. Saul isnt just a mole, he is a head muslim ****ing terrorist. He ranks way higher than Abu ****ing Nazir.
Bill Belichick on "putting the tape on"
SpoilerI think he may have been behind the stuff but not necessarily in league with Nazir. I think he felt he needed to take drastic measures when he figured out what Estes and Walden had been up to.
I do remember reading once that Sam Giancana got mysteriously murdered shortly before he was set to testify in an enquiry on supposed CIA connections to the assassination of Kennedy. That whole thing is just so thick with questions that I doubt we every really find out for sure what exactly happened.