Well.. When California outlawed the
clearing of deadfall and underbrush,
they set the stage for catastrophic fires.
Actually, no, this is incorrect.
First, California did NOT "outlaw the clearing of deadfall and underbrush." Quite the opposite, in fact. Clearing large enough amounts of such on public land especially, was and is, however, far too expensive to accomplish.
In addition, it has been well established that the leading cause of LARGE forest fires, is too much suppression of the smaller ones, which ARE the only way that underbrush is kept in relative check. This is why for many decades, not all forest fires are fought to elimination.
It is not yet known what the PRIMARY cause of these large fires are, however, it is more likely that climate change, and a large increase in tree die-off provided more of the fuel for this fire than anything else.