Sara touched on it in beautiful words of course! I have no issues with an athlete choosing to go and participate.
I hate to bring politics to the Pad, so all I will say is:
There's a diplomatic boycott because of the way China represses and badly treats the Uyghurs. I was sad to learn that human rights activists tried to get people to boycott Berlin in 1936 over the Germans treatment of German Jews and failed. Also, I have been deeply troubled by the way China has backed down on it's promises to Britain about Hong Kong, and have silenced those who speak up about it. So, while I may not make a difference being one little person in Midwest America, for me, it's my way of protesting against these wrongs.