Here you are TM, this should the trick.
Matthew 10:28
Do not be afraid of those who kill the body but cannot kill the soul. Rather, be afraid of the One who can destroy both soul and body in hell.
Or this
Luke 12:4-5
"But I will warn you whom to fear: fear the One who, after He has killed, has authority to cast into hell; yes, I tell you, fear Him!
But I will show you whom you should fear: Fear him who, after the killing of the body, has power to throw you into hell. Yes, I tell you, fear him.
In short, fear the Creator, not the created. Do not fear the first death but the second. That is what the bible says so I think that should give them food for thought.
All the best,
Stephen