it’s so small that completely eradicating them would do exactly nothing to combat climate change
That's not true, did you read any of the link posted?
We live in a society made of billions of individuals, we are not ants or robots, everyone is supposed to do is part. Billionare part count as much as millions of people, that's how big their footprint it.
Why are you wasting your time defending billionares who are screwing the planet and everyone over? Are you getting paid or are you playing the devil advocate?
There are 800 billionares in USA alone and more than 3000 around the globe. My country italy has about 60 million people and spend 130B on public health each year. The 5.7T you mentioned would be enough to cover the healthcare spending that covers 60M people for 40 years.
https://www.theguardian.com/commentisfree/2023/dec/11/megayachts-environment-carbon-emissions-ban