Workplace bullying is extremely expensive for employers. There is lost productivity of the bullying victim. Once the victim leaves, the company has to spend time and money finding a replacement. Then there is a cost because it takes a while before the new employee learns the ropes and becomes productive. But the largest cost is the loss of engagement that affects everyone.
An engaged and enthusiastic employee is more than twice as productive as a disengaged one. When people witness bullying happen to others, and they see no intervention from the company, they become disengaged. If the company is not protecting your colleague from bullying, do they really care about you? That’s why allowing just one bully drags the whole department down. And that’s why it is good business and should be a leadership priority to root out bullying.