Because it’s not a conspiracy theory - there was an impeachment trial about this.

IRC

Billionaire consumption irrespective of how outsized, isn’t significant in the context of our entire societal consumption. Every private plane flight in a year emits 5MtCO₂, while all flights emit 800MtCO₂. Even Roman Abramovich’s ridiculously wasteful superyacht is about 20ktCO₂/yr. All private cars contribute 3BtCO₂/yr. Billionaire consumption is a drop in the bucket, which is why any article blaming billionaires to try to convince you this isn’t a kitchen table issue and infrastructure issue for the rest of us has to qualify with investments, since the average billionaire basically owns fossil fuel companies.

That’s useful information to be sure, because it does emphasize that billionaires profit from emissions, but the end consumers of the vast majority of those emissions, the reasons why those fossil fuels were burned in the first place, are the rest of us, day by day, partially by choice but mostly by consequence of building our basic infrastructure to rely on fossil fuels and refusing to make the investment to decarbonize it.