I would guess you would also be one of the first ones to start screaming “why didn’t the FBI or cops do something about this guy when they found out he was trying to contact terrorists”....after he was successful with his terrorist plan.
Authorities need to follow through, even setting the individual up, to make the thousands of others just like him already in this country more reluctant to trust anyone telling them they can help them murder Americans. One of the best defenses to terrorism is convincing the would be terrorist he can’t trust anyone and that makes his terrorist attack plan all the harder to implement.