I think the Olympics in particular are mostly supposed to be a less violent outlet for nationalism, but I think we learned from the Anger Management craze that safe outlets lead to a normalization and more of the original problem.
Table tennis, for example, is basically a bunch of Chinese people battling it out for gold for their host country. Am I supposed to root for the Chinese-Australians as if they're any more representative of me than the Chinese-Canadians?
It's particularly damning that you picked two countries with almost entirely modern colonial populations.