Bitcoin is torture proof. Sorry to disappoint.
Maybe. But how long can the person who knows the private key, or knows how to get the private key, or knows how to derive the private key, or knows who the other signatories of the multi-sig keys, how long can he hold out?
What will it take to break him?
If you believe there are people that are that powerful and diabolical to abuse that kind of power, then Bitcoin is needed more than ever to stop their evil.