The civilized world needs to get together and form covert hit squads to go after these losers. keep them looking over their shoulders and guessing "am I next?" give them a taste of their own medicine.
Sounds
great. How do we make sure these groups don't decide that
I'm ISIS, or merely a suicidal attacker, and hit
me??
How do we identify these people ... before they do harm? ... and without us harming the wrong people?
This would seem to be the problem.