Theory: Vault 76 was not a control vault.

It was not intended to house America's "best and brightest" to rebuild after the bombs.

It was, in fact, another social experiment where they gathered kleptomaniacs, people with impulse control issues and obsessive compulsive behaviors, pumped medication into the air and food supply to keep their symptoms in check, and then turned them loose on the ravaged landscape after 20 years.

This explains perfectly the behavior of most players and why there is a man in his underwear dancing on the roof of my workshop.