Besides not all info is immeadiatly verifiable. Then what do you do? You have to break the terrorists before they come gunning for you by detering them from gunning for you in the first place. You make the price so confiscatory and so barbaric as to give even the most hardended bastards pause. They have to understand you WILL be a bastard that will stop at nothing to get them. That means you do so very bad and nasty deeds and make sure the word gets spread far and wide you did them and will do them again.