The fact that the world hasn't ended and no nuke has been launched since the 1940s shows that the system is working. Give the button to a random billionaire and half of us will be dead by next week to improve profit margins.
Bikini atoll and the islanders that no longer live there due to nuclear contamination would like a word with you. Split hairs however you like with the definition of "launch" but those tests went on well through the 1950s.