In this sense all of human history has been a horrible tragedy with the vast majority of people (including people alive today), being born in a uncaring universe with a practical guarantee of an alien valueless future.

I agree, but (sheer projection follows) I don't think that our minds can handle that thought in sufficient detail at all without just deciding to give up and play a videogame instead. I.e. such statements might indeed be unproductive and self-destructive for anyone, in any context (although I'm not sure how unproductive or self-destructive).