I don't get why people are so upset about this episode.. Nazir has just lost his entire team, betrayed by his friend, beyond anything else, Brody. He is angry, upset and desperate. He knows that he can't get out of the country alive, because they will be searching him all over the place. So the only thing that he has is to play his last card. Who he wants dead more than anyone? Walden. The reason he didn't go after him before with the pacemaker (using Roya as you said) is that that wasn't his actual plan and what he wanted from the beginning. It's a desperate move from a desperate man. What IS questionable is the way he found out about it. He also knows that Brody is close to Carry (he was instructed to by Roya if you remember), so to kidnap her was reckless but in the end logical. The last conversation of Brody and Walden was priceless. Of course he knew Walden was dying, i mean 5 minutes ago he was giving information to a terrorist how to assassinate him. How could that be a coincidence? Also, Nazir doesn't 'terrorize' just to get revenge for his son, i mean he was terrorist way before that. That was just another motive and rationalization he used and in the end when he couldn't do anything else, that was all that remained. The show is awesome and i hope it continues that way. The show is not stupid, you are
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