Doomers are fundamentally narcissistic and selfish.
Every doomer I have ever met, they love to drum up this "late stage capitalist doomsday apocalypse" but what I consistently see is that they, consciously or not, use it as the ultimate cop-out for why they are going nowhere in life.
It's not a prediction, it is a revenge fantasy. My exes were doomers who loved to say "fuck the system," but are also endlessly preoccupied with fantasies of wealth & success that they lack the ambition & humility to actually achieve.
Their entire belief system implies the mindset that "if I can't have nice things, nobody else should either," but they frame it this way so they can sound morally and intellectually superior. I've even been called a "fascist" and a "nazi sympathizer" because I cared more about pursuing the things I wanted in life than their revolutionary LARP. It's completely selfish and scummy.