Why? Everyone knows about rubber-hose cryptanalysis. The whole point of cryptography is to reduce them to this.

If they want our information, they should have to become literal tyrants, send armed men after us and violate human rights in order to get it. Not push a button on a computer to tap into their warrantless global dragnet surveilance networks and suddenly have our entire private lives revealed to them on a computer screen.

Yes, people will fold if they are kidnapped and tortured. That's not news. Forcing them to stoop to that is the entire design. Once the situation has escalated to that level, you are justified in killing them in self-defense. Torturers don't make a habit of allowing their victims to live and testify about it.