The Tubbs fire was the first of the Northern California Wildfires and started on October 8, 2017 around 9:43 PM at 38.34N, 119.08W -
https://en.wikipedia.org/wiki/Tubbs_Fire. I think this chart indicates that the fire was caused by negligence in connection with starting or expanding an amusement. I base this on Uranus, ruler of the 10th house (parent) in the 11th house. In my research I have found that the 11th house is associated with negligence. The conjunction of 4th house ruler Sun with Ascendant ruler Mercury in the 5th house does suggest that the event was planned, however, I feel that Uranus is a much stronger indicator of cause as it is at a critical degree.
The ruler of the 10th house in the Thomas fire (
https://en.wikipedia.org/wiki/Thomas_Fire) chart is Neptune. I think this suggests that the
parents or cause of the fire is not what it seems to be. Neptune squares the Sun Venus conjunction in the 6th house and Venus is at a critical degree. Venus rules the 5th house and the other sign it rules is intercepted in the 11th house.