"There is a real danger of nuclear war by accident due to technical failure or malfunctioning, or due to accidental detonation or launching of a nuclear weapon.
Nuclear war can also be started by unauthorised action, human error or sheer madness. There is moreover, a great danger of a person or a group of persons responsible for launching nuclear weapons going insane and deciding to launch a nuclear attack on the enemy, eliciting immediate retaliation and a real holocaust."
AQ Khan, the founder of Pakistan's nuclear programme. Quoted in "Pakistan" by Owen Bennett Jones.