Dying isn’t a deterrent when martyrdom is what they seek. The cost factor to them needs to upped by orders of magnitude. Their families and friends and much much more needs to part of the cost. Right now the score is 80 and climbing to 1 in favor of the terrorist.
I think dying is a deterrent. A lot of suicide bombers have a secondary switch detonated by someone else in case they chicken out.
Terrorism is a cheap investment with a high destructive and visible payoff.
That is why the West must answer the challenge. It will take military violence against the planners, backers,financiers,recruiters and weapons' makers. Every year we do nothing, the threat to us grows worse. They are here already. They have funds to back action, mullahs to bless them.
We need to preemptively martyr vast numbers of them, in that case.