I don't think you're self-centered or self obsessed. It's no secret. I've known (rudimentarily at first, I admit) since high school when I read a report I found in the library. It wasn't like a sudden flash of understanding and you knew the whole inevitable bit.
No. It was like putting a puzzle together. You can't see the whole picture or even figure out what it's going to be until you've found enough pieces and placed them in enough to figure out what it's going to be. Right?
If there's any hubris here amongst doomers, it's in thinking back on the memory of finding that first piece themselves and falsely remembering they saw the whole picture. Looking back on a memory with what is now foreknowledge.
In reality, what you're doing is helping them dind pieces and organize them/lay them out enough so that they can get a mental snapshot enough tonstsrt filling in the blanks. To see what the picture is going to be.
And all the while, they've got "someone else", the proverbial devil in their other shoulder, telling them to look away, "that's not a barn puzzle--it's a sailboat", "why are you doing that frustrating puzzle anyway? Come watch the game", and so forth and so on.
As for whether or not it matters. Individually speaking, probably not. You'll have your own grief to handle over that.
But there will always be some who want to try to make it, who don't want to go quietly into that good night. For them, every bit of nudging you can do to get them to where it all clicks, is something to be grateful for. At some point, they will be.
Ultimately, you've got to be okay with yourself.