Because it's the same bad-faith argument that people have seen dozens of times from climate-action-deniers before. The idea that scientists at NASA and dozens of the most prestigious and reputable institutions and journals in the world have all conspired to miss That One Thing That Explains Climate Change that isn't the obvious CO2 that has been known to contribute to global temperatures for about a century.

Eventually people tire of living in Groundhog Day and go through the same thing over and over again and they just click the downvote button and move on.