I caught the second half of a This American Life episode a little while ago. It was about Hemant Lakhani, who an undercover agent posing as a terrorist tried to buy a missile from. When he couldn't get a missile, another undercover agent sold him one. While he was willing to be an accomplice to mass murder, there's no evidence he was able to do so, which makes it arguably entrapment.
The part of the story that really bothered me, though, is a bit near the end (0:51) where they quote the prosecutor, Chris Christie (now running for Governor of New Jersey), as saying it didn't matter whether he was guilty or innocent, because he was a "bad person"!