This is the thesis of the entire movie. Daniel is trying to force his life (and his new relationship with Kumiko) to go a certain way. But Miyagi teaches him that you can't force nature. You have to have a strong foundation (strong roots), and then let life happen. Johnny Lawrence was a bully. He was mean, sure, but he had a code (however twisted). Chozen, on the other hand, is terrifying.
The shift in scenery is the best thing that could have happened to the franchise. We leave the strip malls and skate parks of Los Angeles for the windy, ancient villages of Japan. Karate Kid- parte 2
Go to Okinawa. Watch Daniel learn to catch flies with chopsticks. Watch him survive a typhoon. And watch him grow roots strong enough to last a lifetime. This is the thesis of the entire movie