The Skin of Others in your Game
The only way we have left to control suicide-terrorists would be precisely to convince them that blowing themselves up is not the worse-case scenario for them, nor the end-scenario at all. Making their families and loved ones bear a financial burden –just as Germans as still paying for war crimes –would immediately add consequences to their actions, inject that element of skin in the game that is needed. This requires some care in preventing their families from feeling martyrdom –the penalty needs to be properly calibrated to be a nuisance without imparting any form of heroism to the person.