Entrapment seems to be a common tactic. The details of most of the arrests of would-be terrorists that they catch in the US are clear cases of entrapment. The FBI/NYPD/some paid informant finds some antisocial/inept guy who's floundering in his life and try to radicalize him and then give him a plan and tools to carry out some terrorist act.

Here's one case, but there are many: http://www.guardian.co.uk/world/2012/mar/26/taliban-sympathi...

Pay attention to the details next time you read about a foiled terror plot in the US. A couple of them seem to have been legit but most follow the pattern.

[Edit] I became curious about what happened to this guy so I Googled him and found this: http://pittsburgh.cbslocal.com/2013/04/26/alleged-taliban-sy... looks like they threw the book at him and sent him to prison for 8 years for having fired a gun at a firing range. [/Edit]

I think we can just call it murder. "Entrapment" implies that the end result was that he was punished in what would have been a lawful way if he had committed the crime of his own accord.

Entrapment laws are a defense from prosecution, and they're different in every state. Normally it's only entrapment if the cop is enticing someone to break a law he wouldn't have broken otherwise. In this case if the guy was betting on games every Sunday the jury probably would have taken a dim view of an entrapment defense.

The shooting is another issue. The cop is saying it wasn't deliberate, and that's probably true.