Humans are evolved to fit this gravity well. We use the gasses and metabolites here. Trying to leave the planet and make it all work in the dark, cold, bleakness of our solar system is ridiculous. Our lives are fragile and our lifespans too short to make anything offworld viable.
Our robot descendants will inherit the stars instead. There's nothing wrong with human life being just a stepping stone to bootstrap the hand off.
“Trying to leave the savanna and make it all work in the dark, cold, bleakness of Europe is ridiculous.” - some early hominid, fairly recently
We should empower them to go where we can't. In a sense they'll be our children, carrying the torch and memories of humanity with them.
Like if they have a society, maybe their founding myths will involve a baby robot created by some (non-human) robot deity, or if they are more rational a pseudo-scientific story of evolution from a toaster.
And once we had done that, we couldn't go back in significant numbers before inventing sun cream to functionally replace the melanin our bodies no longer produced in enough quantities to prevent our skin burning and developing cancer just from being in the sun.
Technological progress may make this all faster than evolution, but a mechanism that's optimised for Venus may freeze solid on the hottest day in Death Valley, Earth.
Ask yourself why. What's the real job to be done by humans on Mars? What's the real economic situation? How does it map to human desires?
Robots will do the job even better than us and will see 10,000x the investment. Evolution follows gradients of least resistance.
Human history offers plenty of precedent for this; "we want to run things our own way", "all the land is taken where we live", etc. I don't wanna live in Scottsdale, AZ either, but someone does.
(And I'm saying that as an optimist because I want the billionaires to develop that tech: the ability to fully terraform Mars into a self-sustained world is necessarily also sufficient to handle any imaginable damage to Earth up to and including a surprise impact with a moon-sized rock that excavates the crust and mantle everywhere to a depth of a few thousand km, meaning that things like greenhouse gases and biodiversity would become as easy to fix in that future as a single broken window is today; even just the bare minimum of a single self-sustained domed city on Mars means most environmental issues have to be "solved").
Nevertheless, I think "my skin burned and blistered" is a bit more immediate with the painful feedback, even if it's not as extreme.