Definitely one of the most unpleasant jobs* of a manager is having to hold people accountable for their actions in this way, but yeah. Refusing to address it is

Definitely one of the most unpleasant jobs* of a manager is having to hold people accountable for their actions in this way, but yeah. Refusing to address it is the coward's move, and it'll destroy your culture. * Second only to having to field questions about and spin upper management decisions that you also disagree with.