In your typical large company, there's always enough nebulous process as to minimize personal accountability for any decision that is made. There might be a decision maker in practice, but there will be enough wide meetings and committees so that the groups as a whole can make bad decision, or a very immoral decisions, with minimal risk of consequences for anyone involved. Raising tough questions in those rooms is a good way to not make friends, and end up isolated in an unimportant position after the next semi-anual reorg.

Even in companies with a strong CEO who is, in fact, lording over everyone, mechanisms will be built to make sure said CEO's bad decisions were group decisions, and that most of the people around him agreed.