We can solve nearly all domestic terrorism problems by creating a 10-year ban on all travel and immigration from 20 M.E., North Africa, and South Asian countries.
Very cheap, very simple - so it will never be done.
BUT you CANNOT solve their “problems” in their bedrooms from where they are taking over the U.S. without firing a gun shot, but “firing” away with great pleasure in the beds. That’s the method they have used in Europe for decades now!!!