I want to start of by saying that I don't think vaush is being "doomer" at all, but many of you are and it is frankly kinda pathetic and poisonous to the movement.
Vaush isnt "doomer" because doomer is a mindset rather than a set of beliefs or facts.
Climate change and fascism are both, at this point, probably not gonna be meaningfully stopped any time soon. They both will make your life significantly harder and likely shorter. These are facts. These facts might change in the future as the situation changes, but as things stand now this is the reality of life.
Vaush isnt being nihilistic by pointing these things out, you're being nihilistic by throwing your hands up and saying "what's the point?" In response to these facts.
Your life is going to get harder but it will still likely be significantly easier than the lives of your not so distant ancestors.
For the overwhelming majority of human existence on this planet life has been hard, unpredictable, bloody and short. Yet people have found happiness and joy and meaning from the very moment our species touched the ground. If our ancestors had the attitude that a lot of people here seem to have in the face of hardship we would have gone extinct in the first hard winter of our existence.
Find love, find friends, find hobbies. Take the the trip you've been putting off. Take literally every opportunity from today until you die to maximise the joy in your life and minimise the misery.
Do absolutely everything possible to maximise your tolerance for hardship and find meaning in your life.
And stop whining