Dire measures have to be taken against these useless slugs. For one thing, issue a warning that for every innocent hostage they kill, we should kill ten terrorists in custody. And no mercy shown towards these oxygen thieves. Total extermination.
Not only will that not work, it plays right into their hands instantly making any of their fellow terrorists instant martyrs.
Now, KILL THEIR FAMILIES, lock stock and barrel every single member and watch how fast the terrorism stops.