I would go back to what I read way back in my childhood, when talking of temper, we were told that it is 0recious and don't close it. Evidently it's something virtuous but seen as a vice. Granting it is a vice, why it is seen as such among the virtuous. I have seen many a virtuous person with this vice. They are people who despise treachery and injustice and show up through their temper. It's a welcome virtue.