I don't disagree, just like there is a substantial difference between living in a submarine and living in orbit. But we've gone from "impossible to live in a submarine" to living in orbit in less than 100 years."

There are a lot of indications that 'living under conditions that were true for the last 1500 years but may not be available again for a while' is also a good plan. A city on Mars is likely a 100% energy sufficient and materials sufficient city. Such a city could survive any global warming catastrophe as well.

Most of this discussion comes down to various belief systems. I believe that any civilization that can live on Mars will also be able to treat cancer effectively, as well as survive other threats like asteroid bombardment, climate change, or major volcanic events. I don't believe that a civilization that can "only" treat cancer can survive those other problems. Clearly others have a different set of beliefs and that guides their research investment priorities.