It comes from a techno-optimist perspective that attempts should still be made to see if it could be solved in the first place. The binary alternative is a nihilistic "don't ever try" mindset, wherein the Nikola Tesla, Marie Curie, & Joseph Fourier shouldn't ever try to solve existing problems, and that they should just toil in misery like the rest of us.
There definitely exists gradients in between the two, but it's worrying that HN, a supposed place of hackers/experimentalists, is adopting a more "this'll never work" stance over time. The Dropbox negativity was the popular start of this downtrend, & I fear it's getting worse.