Originally Posted by
Adamas102
Your base premise that he only had the one choice is wrong. "It was the only viable option with the time they had" is meaningless because he had no idea how much time he had. In the time it took him to argue with Uther he could have issued the necessary commands to take another approach. That's why there is a chain of command. He only has to relay a few orders to his captains which in turn are carried out down the line.
Uther says "There must be some other way", Arthas says "You're right. You, you, and you. Order your men to set up a quarantine zone here, outside the walls. Watch out, many of these villagers will become undead soon so keep people in controlled groups. Try to separate the sick from the healthy. You, you, and you. You and your men are coming with me into the city, we're going to funnel out as many people as we can. Keep an eye out for anyone who is sick, they could turn at any moment. Those who are not sick, rally them to fight the undead that we will begin to encounter"