Advocatus diaboli:
1) it works in the movies (esp. mafia movies) because it makes others afraid to talk
2) they make it look like an accident (and therefore any accident could be a murder attempt)
3) this secret is so big that conventional methods don't suffice (and common sense no longer applies)
You're calling it "tall tale", I've called it hearsay.
Grusch's lawyer told him what to say to avoid looking like an accessory after the fact.
"Three May Keep a Secret if Two are Dead"
— Benjamin Franklin, "Poor Richard's Almanach" (1735)
[h2][/h2]
1) It works in the movies because everyone knows why they were killed. Has the CIA announced publicly recently they've killed US citizens in the US for leaking? Not that I have heard.
So people don't know to be afraid.
2) Make it look like an accident?
So again people don't know to be afraid because they don't know the death was in retaliation for leaking.
3)A secret so big common sense no longer applies?
So you think you know ALL of the secrets the government has and this one is the biggest?
Talk of the government killing to keep secrets is talked about outside the Intel Community, not inside of it.