Tough leaders are usually seen as ogres.
Their exacting demands and high expectations add to stress levels. And their obsessive-compulsive behaviour can have a negative effect on results if they don't understand how to control stress to get positive results without serious negative reactions.
The same kind of leadership challenge can be found in the Army. Management at all levels are faced with the decision of "tough leadership" or "easy does it" in preparing troops for combat and on the battlefield.