Never thought about it that way, but you are right, a system so vital and critical should never be left for 1 human to deal with, reminds me of missile systems

Never thought about it that way, but you are right, a system so vital and critical should never be left for 1 human to deal with, reminds me of missile systems where you need 2 keys and Passphrase's, did they ever resolved this? I'm guessing no.