Your first point is moot, because a person could point a gun at you even when you don't have your computer and demand your passwords, or even kidnap you and for

Your first point is moot, because a person could point a gun at you even when you don't have your computer and demand your passwords, or even kidnap you and force you to log on somewhere else. This solution doesn't aim to prevent that kind of thing. Your second point is moot, because the intent is not to protect the hardware, it is to revoke access to data. A self-destruct protocol is not about preservation of property. Your third point is moot, because the intent is not to be convenient, the point is to create a dead man's switch. You're thinking about this from a Consumer/Enterprise standpoint, but that's not what this is for. This would be great for political activists in oppressive countries, as an example.