There are some sick people out there who love to commit a
large act to read about it in the papers. Still, a lot of
natural occurrences can take place during the dry fire
season.
A few sick idiots, the occasional bum. Sometimes morons using power equipment or engines in dry areas.
But as a native Californian I know for a fact that plenty of fires start just by themselves. Always have. Hell, redwood trees NEED fires (which they can usually survive just fine, at least until we started suppressing wildfires) to reproduce. The ding-dongs who make everything a conspiracy don’t really know what they are talking about.
We had a lightning started fire just last year; no dirtbags or Jewish space lasers needed. And of course having power lines unburied, it really doesn’t take a lot to start a fire.