Some jurisdictions force people to decrypt their drives under pain of contempt of court. Some jurisdictions use rubber-hose cryptanalysis. Full disk encryption protects against neither. This protects against both.
How does this protect me from them not touching my computer at all, walking me in to a different room, tying me to a chair, and... uh... "asking politely while showing me a warrant" for me to decrypt the device and disable any security features?
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Some jurisdictions force people to decrypt their drives under pain of contempt of court. Some jurisdictions use rubber-hose cryptanalysis. Full disk encryption protects against neither. This protects against both.
No more than zeroizing the key would.
How does this protect me from them not touching my computer at all, walking me in to a different room, tying me to a chair, and... uh... "asking politely while showing me a warrant" for me to decrypt the device and disable any security features?
I'm not sure but there might be a destruct key. Give them that, and have them nuke the drive for you :)