Because the little preview blurb up there didn’t make the connection to Japan clear and because people won’t read the article most of the time:

The attacker first targeted a Japanese mother and her child waiting at the stop and then tried to get on the bus, which was carrying Japanese schoolchildren. Hu immediately rushed to help and her courageous act “prevented more people from being hurt”, Suzhou police said.

Hu Youping, 54, was stabbed multiple times while trying to restrain an attacker at a school bus stop in China’s eastern city of Suzhou on Monday. She died in hospital two days later.

I don’t pretend to understand the politics of the extremists, but Hu Youping is a hero. RIP.