The right to make a mistake
Sure, there are a lot of emotions on the job, but managers who blow up when their employees make a mistake are bad news for a company. There are two different sorts of mistakes. There are errors of execution, which can cause delays and difficulties. Obviously, the boss wants to eliminate them. Probably, he or she may have low tolerance for repeated mistakes a company can ill afford. Still, errors of execution, as serious as they may be, can be corrected. Employees can be properly trained.
On the other hand, an error of omission -- when the manager doesn't even realize a mistake is being made by the company' itself when its strategy is wrong or poorly adjusted to market reality -- can kill a company. If employees are too afraid to speak up or unmotivated, a manager is swimming in his or her own blind ignorance. Managers are not hired to manage ignorance.