Why is this downvoted?

It probably doesn't help that every scientific advance gets co-opted to make the rich richer and civilization worse.

I guess the world oscillates between good times and bad times. Those who are born in bad times get to see the world improve drastically and helping that along is a purpose. Those who are unlucky enough to be born in good times get to see everything crumble. At best they can inspire the rebuilding just before dying of old age.

We shouldn't be so sure about the fate of the universe. If you were born after 1980 you probably feel more certain about the eventual fate of the universe than people born in 1940. A lot of scientific advances that enabled us to even predict the universe isn't steady-state are less than 100 years old. They may change, and our predictions accordingly, in the next 100 years. In fact they did change several times. There was the steady state, then the big crunch, then the big rip, then the heat death. We can't be sure about heat death either - dark energy adds more energy into an expanding universe, which may be exploitable forever.