Yes, police have every right to question someone.
If Rahim was so dangerous, why didn’t the constant surveillance result in any charges? If — as the media spent all day claiming — he was on the verge of executing a horrific terror attack, why didn’t law enforcement agents have an arrest warrant or even search warrant?
This method doesn’t match up with how the FBI conducts business with someone this “dangerous”
Like I said, it is hard to make a case that someone is going to cut someone else’s head off based on private talk alone. Knives are common. In most terrorist cases, the would be terrorist has to go purchase components of their terror and a case can be built on that showing actual intent.
And if the police provoke him into acting badly by talking to him, good for the police. Case closed.