Empathy is a good way to deal with a bad boss. Not so you can feel sorry for the boss or better understand his point of view. There’s a more basic reason. Empathy lowers stress (Ciaramicoli, 2016). What’s the byproduct of a bad boss? They stress you out!
Empathy can be an coping mechanism. By putting yourself in their shoes and looking for more positive explanations of their bad behavior, you can lower YOUR stress. Chances are, you’re never going to change their bad behavior, but you can change the way their bad behavior impacts you. Try it!