"But wait," someone argues, "shouldn't a good man get angry if he sees his father murdered or his mother attacked?" No, he won't be angry, but he will still take revenge or protect them. Why do you think love for his family won't be enough motivation without anger? You might as well ask, "What then? When a good man sees his father or son being killed, won't he cry or faint?" — like women do when they hear even small rumors of danger. The good man will do what needs to be done without panic or fear. He'll act like a good man should, without doing anything unworthy. If my father is being murdered, I'll defend him. If he's been killed, I'll avenge him — not because I'm upset, but because it's the right thing to do.
“What, then,” asks our adversary, “is a good man not to be angry if he sees his father murdered or his mother outraged?” No, he will not be angry, but will avenge them, or protect them. Why do you fear that filial piety will not prove a sufficient spur to him even without anger? You may as well say—“What then? When a good man sees his father or his son being cut down, I suppose he will not weep or faint,” as we see women do whenever any trifling rumour of danger reaches them. The good man will do his duty without disturbance or fear, and he will perform the duty of a good man, so as to do nothing unworthy of a man. My father will be murdered: then I will defend him: he has been slain, then I will avenge him, not because I am grieved, but because it is my duty.