Yes. Every country should have the right to secure it's borders, in the sense of keeping illegal immigrants out (but not keeping emigrants from leaving).
On the other hand, I don't support the Wakanda monarchy, particularly the part where an heir to the throne has to defend that right by mortal combat. Suppose the heir had been elderly (like Prince Charles of the UK, for example?) or someone clearly at a physical disadvantage (like T'Challa's sister) but still clearly the more intelligent person? This seems like a blatant examples of ageism and sexism.
I also don't support the way the Wakanda military initially felt obliged to support someone who was clearly a maniacal usurper, leading to a Civil War.
I also don't support the way Wakanda has been so selfishly hoarding its technology and riches, especially with distraught neighbors like Rwanda, Somalia and Chad. And I especially don't support Wakanda's initial outreach program in the midst of the worst managed continent in the world, they chose to basically open a Youth Center in Los Angeles. Talk about mixed-up priorities...
And I don't support the way Wakanda has a world-wide network of agent / provocateurs, apparently ready to leap into unquestioning action committing acts of sabotage and violence in other sovereign nations when ordered to do so.
Why no one on the liberal side of the spectrum is contemplating these anomalies, and are instead praising this film as being such a stand-up hero story for blacks around the world, baffles me. Racists from the left are as bad as racists from the right: All they see is the color, and not whether the color represents something good...or something bad.