From the linked article:
King, who joined the U.S. Army in January 2021, faced two allegations of assault in South Korea, and eventually pleaded guilty to one instance of assault and destroying public property for damaging a police car during a profanity-laced tirade against Koreans, according to court documents. He was due to face more disciplinary measures when he arrived back in the United States.
I heard - purely rumors - that he had been subject to tons of racism from the South Koreans and finally snapped one day.
No it doesn’t. Why isn’t every other minority serving member in South Korea snapping and taking refuge in North Korea?
You can simply be responsible to the decisions you make.