Prophets are high valued people used by religions around the world, like Jesus, Mohammed, Bhuda, high respected personalities like Japanese Emperors, Ethiopian Emperors and other minor characters. Do you think it's right to mock Jesus the way people do? Or to use him as a character, souvenir or picture to be used anyway you want? Do you also think it's okay when people kill a lot because they felt offended seeing their prophet?
I would not agree if the prophet in ugly because according to us the prophet is a creature that has its own kemulyaan than ordinary people,
And if the prophet is ugly and the one who slander is killed then it is also wrong, as a believer we pray enough that those who are insulted are quickly conscious, and quickly saved in their lives.