One thing

Don't forget aids....and doing something about the monster ruling Niganda... They have the tech to do whatever they want really, economically dominate their Earth if they wanted. I think its about the view of we take care of ourselves *beep* the rest of the world don't enter our territory.

Eh, I think the way their ego was, the reason for not giving the cure for cancer is because the western powers didn't show they deserved it. And while you could ask, why should we let the people die because of the way their leaders are, it sort of worked into a sort of socio-political statement on how we see some nations as evil, or against us, despite the people not being 100% behind such leader.

Also, I think they just didn't want to hand something over to nations which, of them, were the type who once Wakanda handed over the cure, would probably still not give any to their citizens. If anything, it would have been given to the rich and powerful as the poor still got the same old same old treatment of chemo. At least, that is how I took their position.

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Writer at http://amari-sali.blogspot.com/ featuring Overview/ Reviews (with Spoilers)

They should rename Wakanda "Deus Ex Machina Land" because whatever they need to survive they have already discovered/invented it. A nation that isolates itself tends to be backward and oppressed, North Korea is a perfect example. For some reason Wakanda is the exact opposite but Marvel never seems to explain why. Are Wakandans aliens? It's the one thing that always bothered me about Black Panther in general, and this series made me roll my eyes even more every time a Deus Ex Machina appears (I'm sure every fighter that goes out on patrol has knock out gas air to ground missiles). It's this type of piss poor writing that is going to keep Black Panther forever as a secondary character you only pull out occasionally to meet your ethnic quota for the month.