Partially, not THEIR personal death, but the death of their families and friends/loved ones .. perhaps closer to the mark. In history, it is the reason that if caught or killed, their families would also die, their homes destroyed, even their animals destroyed. Their history, removed from existence. When this happens with regularity, it changes hearts and minds.
Under islam for most life is so joyless that they welcome death. But the killing of their entire families thus eliminating them from the gene pool does scare them. The Bible calls it cutting one off.
***** That’s the only way to overcome them. Sterilize the remainder.