He rarely roared, and when he did, it was for a good reason.
Timon and Pumbaa never questioned it. To them it just made him seem less lion, less dangerous. They didn't know the real reason.
Deep down, he knew that it was his fault. That if he hadn't been practicing on that creature, none of this would have happened.
Before, he had been teased , taunted, about his pitiful roar. Nobody thought it could do anything.
But it had, it started a stamped that killed his father.
When he had returned to the Pride Lands, he had started to roar again. After learning the truth, his roar had stopped symbolizing his father death.
He hadn't killed his father, so why should he be so against the act?
His father had had a great roar, shouldn't he have one as well?
Small Lion King fic, thats all