I literally linked to his essay above. Its journalistic but nobody seems to have taken up his challenge and unpicked the hyperbole from the serious arguments.
Edit: His major achievement is a series of talks explaining the long-term doom of venture-capitalist funded websites and the surveillance-advertising complex and the dubiousness of the AI cult in the California vernacular
https://idlewords.com/talks/ He seems to have become depressed after several short-term ventures into American politics and labour organizing and has been neglecting the business that pays his rent (but that stuff takes decades! giving up after a year or two is premature)
Edit: examples of responses to "Why Not Mars?": a classic bad forum thread
https://forum.nasaspaceflight.com/index.php?topic=58511.0 and blog post with an actual argument
https://www.jwkash.com/questioning-my-religion-why-not-mars Note the manned spaceflight advocate's term"existential risk" and see
TESCREAL ("what if some disaster ends life on earth?" has been a favourite gambit by American advocates of manned spaceflight for my whole lifetime). Most of what I can find is short responses by randos saying "I agree completely!" or "I disagree completely"
Edit: the Oceangate submarine disaster let us empirically test the space-advocate argument "NASA is too cautious, we need to take a few risks to get things moving again." Everyone who has close contact with NASA seems to agree that they are very bureaucratic but these are hard problems and when you try and fail people die (see also
Theranos, Inc.).