I found this in one of the website: Ravana Honoured Then turning to Laxmana Rama said, "O dear brother, look the mighty Ravana is lying on his death bed. His knowledge of Vedas and Scripture is beyond doubt. But equally true is the fact that you will not find more knowledgeable authority on politics, statesmanship, and sociology on the earth today. Please go and get the knowledge from him." Thus Laxmana, sitting at the feet of Ravana, learnt many useful things on diplomacy, politics, tax structure, social reforms, war preparedness and many more from him. When Ravana breathed his last, Rama himself conducted the last rites befitting the grandeur of Brahmin Rakshasa King. Thus one important aspect of the Divine Play - LEELA - enacted by the Lord came to an end. Ravana and Hanuman, Laxmana and Sita, Sugreeva and Jambuwanta, (and all others) were but the actors playing their allotted or designated role. Nobody is all evil, nobody is all good! The human form by necessity brings weaknesses to the human character. Some appear sinner, some saint!