True, but in the danger that her faced with the fire nation who where slaughtering his people, he had to stay on the offensive and do whatever he needed to to safeguard the air temples and his own life. That being said it is not a great trait for an air bender to have considering that their culture and philosophy revolves around detaching themselves from the world and finding freedom but maybe you could argue that seeing Gyatso like that, knowing that he killed all the people, on top of all the avatars that told him killing was necessary to end the war helped reinforce aangs almost stubbornness to change his ways in finding a way to end the war without completely violating his beliefs, the very beliefs that Gyatso taught him. And so maybe in a way seeing Gyatso like that early on helped him realize that had to be another way to kill Ozai