Nah, just blow them all up. Everytime they take a hostage you kill 20 with drones filled with pig ears. Make it so horrific to them that they won't even think of doing it.
WHEN YOU GET BACK THOUSANDS OF YOUR FELLOW TERRORISTS FOR 20 LIVE HOSTAGES; KNOWING FULL WELL THAT THOSE THOUSANDS ARE GOING TO KILL FAR MORE THAN 20 ISRAELIS