Any single pilot operated aircraft only paid lip service to the 2-man principle.
Once alone he can enable or disable the system. Even a 2-crew aircraft like the Buccaneer was not immune, although it was probably safe from an unauthorised release.
I once monitored a crew where the Nav got all the correct light reactions to the check list but ended up with the weapon safe and not armed. The simulator had side-by-side seats so the pilot intervened. As the aircraft was tandem that crew failed the check.