The California Public Utility Commission’s audit of PG&E screams for immediate action — but not just against the utility. To fully ascribe blame for safety problems, regulators should be looking in the mirror.

Audit findings reported last week confirmed that PG&E collected more than a half-billion dollars from ratepayers in recent years for system improvements that never were made. Some of that money was spent instead on cash bonuses to its corporate executives. Had the money been invested as promised, it might have prevented the 2010 San Bruno gas pipeline explosion that killed eight people and destroyed 38 homes.