Race at the All-Valley Karate Tournament

I am certainly not the first to have noticed that the entire Karate Kid franchise has some, well, fraught issues with race.

But still. How is it possible that in 1984, in Southern California, at an event called the All-Valley Karate Championships that must have had a catchment area of at least a million people, there is not a single Asian American in attendance aside from Mr. Miyagi?