Similar to perfect murders is analyzing the behaviors of nearly perfect kidnappers.
Holding the secret of a dead body is easy compared to holding the secret of a live body that you have to feed.
Murder and kidnapping are the same with these exceptions:
a) Murder is more socially acceptable
Hm. Outside of that, and the person/people still being alive, not much.
Example of the social acceptableness factor:
a) “I killed a man once”.
b) “I kidnapped a man once”
Major street cred difference there. Yet, which one is more powerful?