What you say is reasonable, but may I share with you that God gives to each man a unique assignment in life depending on His plan. So correct me if im wrong, but Dr Munroe's focus was on Purpose. With that comes the need to manage/ discipline your life hence the preachings you referred to. You don't reach out to the world through direct confrontation, that's why Jesus used to hang with the misfits. And Mandela was not perfect, but he achieved success we can all learn from.