Has it occurred to you that if your device is full of side channels, anyone can use those side channels? How can you create a legitimate-government-only side c

Has it occurred to you that if your device is full of side channels, anyone can use those side channels? How can you create a legitimate-government-only side channel? You could do it by basing all encryption off a master key that only the legitimate government controls. However, there's no way for a legitimate government to force everyone to only communicate with the master key. Any other side channel is going to be exploitable by non-legitimate-government's in some way.