There are large swathes of earth that are too inhospitable, like deserts. They're more accessible and easier to support life in than Mars, and yet no one lives there.
The deserts even have breathable air.
The deserts even have breathable air.
Antarctica is even more inhospitable than deserts, and there are people living there for research purposes.
Going a little further, living in the ocean is easier than living on Mars. As far as I can tell there are no billionaire-funded submarine civilisation programs.
OTOH, if one of those took out human life on Earth, people living on Mars could re-colonize Earth.
It's hard to imagine anything that would make Mars a better place to live than simply staying on earth.
That said, I'm definitely on the side of making Fresno a paradise before we try mars.