......You think you can and that folks is how people get caught.
Of course it is. It's also how criminals actually get away with crimes.
I'm sure that the clearance rate for car-fire arson investigators is really high - because the investigators are looking at fires that show signs of arson. But I would be stunned if they give even a cursory second look to even 20% of the fires, because nearly all of them show every sign of being routine
... and most of them are, because a lot of these cars burn.
We don't need to rely on pictures or second hand stories - guys on this site have had fires. Several JPSs I know of, Ron O'Black's car, and almost mine. I'll bet if I dug I could come up with at least 10 full fires, or near-misses of posters on this site. The hard part about this hobby is keeping these cars from burning.
Those fires might get looked at, but because they are so common, they almost never get looked at as a full-fledged insurance-fraud investigation.
All I'm saying is that it's an easy thing to say, "we solve 95% of all car-arsons", but how does anybody really know that none of the hundreds of innocent-looking fires were intentional? I can't say it with certainty and neither can anybody else.
This isn't like a robbery, where everybody knows when a crime has been committed. Nobody has any idea of the actual number of intentionally set car fires, so nobody can know how many people actually get away with it.
"We solve almost all of them" is impossible to prove. It would be just as easy to say that they solve almost none of them. Neither claim can be verified, because nobody knows the actual percentages of intentionally set car fires.