Answer:
Yes, they are wrong to do so.
Explanation:
First, it is best to establish that Wakanda is a fictional state which appeared in American comic books. Perhaps, its creator wondered what a Civilized Africa would have looked like today if it was left undisturbed by colonial influence.
That is by the way.
According to the description of Wakanda, it was rich in tech and rare minerals such as Vibranium which can absorb energy and release it kinetically. Wakanda, according to fictional sources is the most technologically advanced nation on the earth.
Long story short, Wakanda had all the tech it needed to protect itself and some.
If Wakanda was that self-sufficient and so advanced, it means that it had all the power required to act as a voice and where necessary, a protector of black people and Africa all around the world.
We see America holding a similar position, deploying military personnel where necessary. One of the reasons, why it does this is because it can.
To whom much is given, much is expected.
If there was a vacant spot for a nation that could let it's voice, it's arms, it's resources to the protection of the black race, it should have been Wakanda.
Cheers