Toxic workplaces exist because the leader is either actively encouraging and participating in this behavior or they are ignoring it. BOY, did I learn that! Even confronted most of the "leaders" ignore it still, and then take sides!
When employees respect each other and get along in the workplace, it's amazing how productivity increases, morale increases and employees are more courteous to customers. Too bad some people would rather be entertained by drama than to see this happen.