I don't understand how you can continually enjoy watching this show, when you find, basically, the whole premise (that a US Marine POW has been turned and brainwashed to be a terrorist for the "other side"), hard to believe or that his actions don't make sense. Brody is doing everything he does BECAUSE he was brainwashed/turned. Yet, he is not a totally different person. He knows he needs to pretend to be loyal to family and country yet, in reality he is no longer. Sure, he gets conflicted, but overall, he was brainwashed and now he needs to cover his tracks, lest the US find out that he is 'on the other side'. Or, even if he IS having second thoughts, what he has already done makes a damn good motive for having to continue to lie and cover his tracks. Of course Nazir can blackmail Brody. It doesn't matter who believes Nazir, as long as Brody believes that he can be "outed" and the resultant consequences. Relax and enjoy the show!