Millennials catch a fair amount of guff from older generations, much of which echoes criticisms previous generations had of previous generations had of... The wheel of time spins. But one thing that Millennials (even Gen X) have minimal awareness of is living in the shadow of nuclear war. Putin's rhetoric over Ukraine has put people on alert, but it's nothing compared to live news feeds showing the destruction of Hiroshima or warheads being deployed in Cuba, pointed at the US. Capturing the anxiety and folly of this atmosphere is Mordecai Roshwald's Level 7 (1959).
Level 7 is set in an underground arcology, built as a massive nuclear bunker for half million people. It is told through the eyes of X-127, a technician whose only job is to stand in front of a panel of buttons that launch nuclear missiles, and push when directed. Living on level 7 in the arcology, he interacts with other technicians, teachers, psychologists, engineers, etc. who share the level. X-127 settles into his role quite easily, his emotional expectations minimal. And with no wars happening, his life goes smoothly. There are no buttons to be pushed. That is, until the klaxons sound.