> Humans are awesome,
Some humans are awesome. Other humans not so much.
> intelligence is awesome.
It is indeed, but intelligence is pretty unevenly distributed among humans.
> More humans means more amazing things.
It also means more stress on the planet's ecosystems. There are awesome things on earth besides humans, and one of the problems with humans is that too few of us seem to understand this.
> we have the ability to save our planet
In theory. The jury is very much out on whether we can actually do it. Personally, given what has been done to address climate change so far, I'll give long odds against.
> We cannot outgrow this planet and colonize other worlds
And who says that these are good things? If we can't even manage to bring this planet to a sustainable steady-state what makes you think we'll have better luck elsewhere?
> without MORE smart people.
More smart people is not the same thing as more people.