They should be held responsible for it if they don't repair it in a reasonable amount of time. They are required by law to keep equipment in safe working order, but they have a terrible track record of doing that.

I wouldn't blame PG&E if somebody damages their equipment and causes a fire that day or sometime soon after. But if it's been months and the equipment is still lying on the ground with bullet holes in it that proves PG&E didn't inspect it or repair it for a long time.