If the fire was a natural fire, coming from one direction and moving towards one direction, everything in its path would be wiped out. What you're seeing in that video is not one fire moving in a single path. What you're seeing is multiple fires originating from each property one by one. Why? Because the trees are standing. Some people will say the trees are there because of their sap. I don't buy that. If the fire was as hot as it looks by all the destruction, those trees full of sap or not, would be gone.

I agree that it seems nefarious but we first need to ascertain that the skipped houses were made of the same material as the ones burnt to a crisp. Old dry wood that has had the sun beating on it for years burns a lot faster than houses made or poured cement, And yes, the wealthy are more likely to make their houses out of materials less likely to burn.