There are quite a few high profile (in the media anyhow) cases where nutjobs get off on starting fires, yeah. But the really dark shit starts to happen when (ahem) alternative media sources start to imply that all arsonists are paid state actors and/or sexually aroused political players doing all the arson.
It’s usually insurance-related. Or accidental. Nothing that sexy in the vast majority of them.
My favorite was last year during the very real wildfire issues affecting western canada where the flat-earthers kept posting video of actual forestry worker helicopters torching brush piles (something they actually do, during the off-season, to clean up tinder piles) and conflating it with “treaudeauh-paid ANTIFA super-soldiers out to bring in 15 minute cities and permanent state control by burning society to the ground” or whatever the hell. The absurdity of it all kinda turned me on in the other direction, ngl.
Jaimie Johnson who filmed the documentary Born Rich (and its sequel) pissed off enough of his family and peers that he was almost thrown out of high society for exposing its underbelly. He also lives a pretty normal life echewing his family fortune which is pretty dope. Might be along the lines of what you’re looking for. Good films either way.
ETA check out The One Percent as well, his follow-up from the first film.