[Majromax]

> I'm just not so sure that if you accidentally knock over one domino and a cascading whole room full of dominoes falls that you should take the blame for the cascading effects.

Yes, you do and should take the blame under the eggshell skull doctrine (https://en.wikipedia.org/wiki/Eggshell_skull). If the initial action was unlawful, then the perpetrator bears liability for the full set of consequences -- even if those consequences are more severe than normal based on unknown factors. Here, PG&E was clearly guilty of gross negligence in their maintenance, so they bear liability for the consequences.

Worse yet, this background situation wasn't previously unknown. The enhanced fire risk was widely understood, which would put PG&E under an even greater obligation to ensure their equipment was operated safely.