There is a fact in wildfires that is often ignored. Often, (very often) this is not a case of bad luck or neglected nature, is just a problem of sabotage. A crime. Twenty five starting points in the same area the same night. People keep blaming nature instead.
You can't stop criminals just removing combustible and cleaning. They can and will provide their own combustible. A few gallons of gasoline is all that they need.
We would need something like the ink companies do since years. A way to put a fingerprint in the gasoline so, after a wildfire (or a home fire) some harmless chemical compound could remain in X concentration and point to the fuel station selling the combustible. Maybe a mix of several aditives in different concentrations and different times could provide enough variability to make a short code with station and month. Then you have the arsonists and their vehicles filmed in camera. Still a lot of people to check but, as many arsonists are recurrent, you can look for patterns. Could be silently implemented only for conflictive areas by the government and fine tune it to week or even day.