Re: Showtime Drama: "Homeland"
They are not "letting him go", they offered Broady immunity in exchange of his help. They had no choice at this point. It isn't unrealistic, deals with criminals are done to catch a bigger fish. I mean, keeping in mind that this is a TV show and the genre, overall it is quite a realistic show.
And some people are obviously missing on the subtilities of the show. The relationship between Carrie and Broady is extremely complex and ambigious. Carrie decided to use the personal angle to get Broady to speak, and it worked. She is not an idiot, nor is she like a dumb teenager in love. Part of the interview was obviously a game. However it's clear she still has feelings for him so that makes it very ambigious between the 2.
The last episode was the best one, by far.