The story isn’t about the ‘vigilante’ Koreans. It’s about govt/police failure to do their jobs. When govt failed those who wanted to be left alone to live a peaceful life were forced to protect their properties.
Exactly!
Apparently the Koreans sent for reinforcements from Korea who were on their way - when the riots ended.
When the government won’t protect your life, property, family, etc. you must take action do these jobs yourself.