Rubbish. The US Navy's SSBNs work the same way. A second strike deterrent force by definition has to have decentralized launch authority. The backstop is that

Rubbish. The US Navy's SSBNs work the same way. A second strike deterrent force by definition has to have decentralized launch authority. The backstop is that no single officer can launch the missiles, it takes joint action -- and the officers are carefully screened before being put in that position. One rogue sub officer? Maybe. Enough of them to overpower the rest of the crew and carry out an unauthorized launch? Very unlikely, and begs the question of why.