Another huge selling point for me is optimism and positive view of the future.
The future once upon a time was ALWAYS a better place.
And it needs to be this way more often, as Sagan said dreams are maps.
He asked who the cartographers of human purpose were?
Nothing wrong with tales as cautionary warnings,
but lately it's become too easy and common to portray the future so
negatively. Perhaps just the product of our times I suppose.
Well, self fulfulling prophecies of doom or glory is our choice.
I would like some dreams of glory now and then.
--The arching sky is calling
Spacemen back to their trade.
All hands! Stand by! Free Falling!
And the lights below us fade.
Out ride the sons of Terra,
Far drives the thundering jet,
Up leaps the race of Earthmen,
Out, far, and onward yet--
Excerpt, The Green Hills of Earth -Heinlein