What if you had, let's say....5000 Bitcoins in your custody and suddenly someone demanded it as a ransom in exchange for someone very important to you, would you make the exchange?
I don't want to answer your question. lol

because I think it's a joke and I laugh reading what you say.
such as soap operas on television. sorry buddy, you make me laugh.
I too thought of the same when I first read about it. It is funnier than we think if you try to imagine it.
The situation depends on lots of factors and a hack ransom is possible but a kidnap ransom is highly unlikely.