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?
Your question was not realistic pal, 5000
BTC is a huge amount if I am going to convert it into my currency. In the first place, all of us here if you are deeply knowledgeable in bitcoin individually we have our own password and private into our wallet addresses. Probably all of us here also are not sharing our password and the private unless you tell your private to anyone to whom you din't know it personally.