The statement is true: a commitment to being ethical is important for good leadership.
It is important for a good leader to be ethical, that is to say doing things that are morally right instead of performing bad actions, in order to be a positive role model. An ethical leader is someone who, besides treating people with kindness, is considerate, honest and fair. At the same time, a leader with values respects other people's rights; therefore, he/she becomes trustworthy for them. Most importantly, an ethical leader works for a common good.