Interesting discussion on what caused the Palisades Fire (fireworks not mentioned):
https://cliffmass.blogspot.com/2025/01/where-and-how-did-palisades-fire-start.html
Interesting bit in the comments....
Apparently there was an effort to replace the wooden poles with steel ones back in 2019. But this area happens to be home to Braunton’s milkvetch, an endangered plant species. So the California Coastal Commission issued a cease-and-desist order and fined the utility $2 million because of milkvetch removal. Ironically, this milkvetch preferentially grows in areas disturbed by fire.