Never looked at it like that. Yeah, Killmonger had a legit reason to get mad about the state of black people worldwide, just that his methods were too clouded on anger.
On the opposite ends, when T'Challa became king, when he engaged in the "burial" ritual, he spoke to his father in spirit and had a heart to heart convo in the grasslands with a dreamy skyline. After it was over, T'Challa was very happy and fit to lead since the wisdom of his father inspired him.
On the Contrast, Killmonger, when he forced his way to leadership of Wakanda, went for the burial ritual, and was still stuck in the old Oakland apartment he grew up in. He saw his dead father in that scene, and basically was on some "nikkas die everyday, B" kind of steeze. He shed no tears for him, and woke up even more pissed off and even further from peace of mind.
I knew from there that he wasn't fit to lead at all. Causing chaos from within Wakanda and killing anyone that didn't agree with him.