In general, the study contends that the fires are fuel-dominated (too much forest) and not wind-dominated fires. It also contends that the California drought climate has contributed significantly to the problem.
> On the timber-rich interior US Forest Service (USFS) forests of the Sierra Nevada Mountain Range, anomalously large fuel loading due to a century of successful fire suppression and timber harvesting practices has been a dominant factor
The problem is likely too much forest at these level of droughts, so forest management bears some responsibility. Economically speaking though if PG&E has been given such a lucrative business opportunity as a sanctioned monopoly, they ought to be held responsible as well.
Also, the part that is not clear to me and I would appreciate if someone has an answer - speaking cynically, if PG&E as a private company causes damage and tax payers pay, and if PG&E as a state run company causes damage and tax payers pay, why do I care who runs it? Is it just that the prevailing politics in California is that corporate=bad and civic=good?