The entire f**king franchise was about the horrors of unchecked capitalism and consumerism leading to the result of nuclear warfare.
Vault tec is not just the poster boy of the game but also the prime example of a corporation that left to own devises allowed inhumane experimentation for profit. Fallout 1s main villain the master wouldn’t have existed with out the FEV virus they and other corporations were experimenting with.
And in fallout 3 an entire vault was using fev for experimentation and eventually led to it becoming the way super mutants made more of themselves and populated the capital wasteland.
Have they never played a fallout game ever.