Principle 10-1-2
Yes, this anger may be reasonable
Well, the anger may not be very helpful, but it may cause us remember to be more careful in the future.
The question focused on how reasonable the anger was, not how useful it would be. It's hard for me to imagine someone doing this and not feeling angry, maybe very angry, about what happened.
Consider this example. A child carelessly drops some of the green beans for his dinner on the floor. The father reacts with intense anger.
Is this intense anger reasonable?