Maybe present the full quote?

"too many people, so many mass executions of the elderly and infirm make sense is the fundamental fact that everyone dies at some time .make it imporrisbole to ask so why not earilier. if the brain discards unused neurons, why shold socieity keep their equivalent

The radical idea of treating individuals in a society as cells and the society itself as a well-organized organism is fascism, or course. Probably the most efficient and rationally stringent way of governance, if someone could pull it off in a sustainable way; and if it is aggressive and expansive, its efficiency makes it a virus that everybody will want to stomp out. Fascism makes romantic doo-gooders like me very uncomfortable"

He dares to explore radical taboo ideas and concludes that it would be fascism, which he is not comfortable with.

So .. I see nothing where he is intolerant of anything. But you seem not tolerant for people daring to explore certain thoughts in general? Even if they reach the conclusion this is not the way to go. (And maybe even an attempt at dissuading the other person of those concepts)

That's why I didn't want to quote anything because it's just deteriorating into a debate club about hypotheticals.

To extend your "full" quote: "The radical idea of treating individuals in a society as cells and the society itself as a well-Organized organism is fascism, or course. Probably the most efficient and rationally stringent way of governance, if someone could pull it off in a sustainable way… I rather like the treatment Fascism gets in the Amazon Series ‘The Man in the High Castle’, which explores what would have happened if the Germans and Japanese had won the war: A society that tries to function as a brutal and ruthlessly efficient machine, eliminating all social and evolutionary slack. It is very dark, but not a flat caricature of pointless evil for its own sake."

Let's stay away from killing people how about the misogyny?:

"You cannot learn what does not attract your attention. Women tend to find abstract systems, conflicts and mechanisms intrinsically boring."