The US Air force Institute for National Security Studies have developed a reasonable systems approach to deter non-state violent actors who they label as NSVA's. It is an exceptionally important report if we want to deter violent extremism and other potential violent actors that could threaten this nation and its security.
It is THE report our political officials should be listening to to shape policy so that we do not become excessive in using force against those who do not agree with policy and dispute it with reason and normal non-violent civil disobedience.
This report, should be carefully read by everyone really concerned with protecting civil liberties while deterring violent terrorism and I recommend if you are a professional you send your recommendations via e-mail at the link above so that either 1.) additional safeguards to civil liberties are included, or 2.) additional viable strategies can be used.
Finally, one can only hope that politicians will listen to the experts.....without using ham handed steamroller or more fascist police state tactics where subtlety is needed.