As
@Captain Adverse said, "Simply because Insurance companies are not stupid. They are in the business to make a profit insuring risk. The lower the risk the more chance for profit. The higher the risk the more chance for loss."
In California the have a state-run insurance company called The Fair Plan which does insure a home in a brush area for fire insurance and the premiums are commensurate with the brush density, miles from the fire department and fire hydrants and what the home is constructed out of. When the decide to not write in brush areas anymore they notify the policy holders with a minimum of 45 days. That gives people the time to get insurance through the Fair Plan. Any suggestions of cancelation just before the fire are lies.
In a town called Paradise, the entire town burned to the ground. In Pacific Palisades the losses are in the billions and climbing. State Farm pulled out of the state now as have other carriers because California is pro consumer and refuses appropriate rate increases.
THIS is what happens when government controls private businesses. They leave. The Fair Plan didn't have nearly the reserves they need for this fire and California will have to cover them. They are raising their already high rates by at least 25%.