A hypocritical villain who was willing to burn down the villages of people completely unrelated to the village that wronged him, no less.
In the actual movie, Killmonger never got past the loss of his dad, never even tried. He’s still a kid on the inside, lashing out at the world.
Also, Killmonger led an objectively privileged life. Top of his class in the military, worked for the CIA as a top operative, could easily go private.
Also, the BLM riots are heavily against other black people. Just like Killmonger wants to “burn down” a bunch of white villages because, uh, T’Chaka killed his dad? Erik took up his dad’s mission out of revenge, not sincerity. And his mad plan would hurt and kill lots of the people he says he wants to help.