From a purely utilitarian point of new, consider this. It's all very well enjoying power, but ultimately power is only useful if it gets things done without unfortunate side effects. If your behaviour results in high staff turnover, which entails losing valuable experience and expertise, how is that useful to you in the long run, especially if the situation is reflected in students' grades?
This is an excerpt from an article I’ve written for aspiring heads of department (not just Computing departments). Continue reading here: Toxic Leadership