The Professor tells us in short that we must accept that there is nothing that can be done to eliminate this scourge, and that we must accept that people will have to die at the hands of radical islam, because if we take appropriate  defensive measures (for example internment) the islamists will be riled up  which  will cause them to kill our people. This pronouncement has a name: False choice.

Instead if academia wants to be part of the solution I suggest they study and recommend options aiming at breaking the will of the evil doers.