There are two reasons why you're wrong.
First, PG&E can't control the weather but did have control over its operations, e.g., how it maintained its equipment, how much it prepared for problems, how it managed risk. It may be tricky to determine if it's truly at fault, but it's equally tricky to determine that it's in the clear.
Second, a large utility is not like a private company. We cannot let a large utility fail, and therefore they are more like a government organization than a private company. When they mess up and hurt people, everyone needs to pitch in and help, not just those that are affected, as everyone shares the benefits and responsibilities of keeping them afloat.