Regarding the incident that caused trouble at a specific point in time, which the police officer feels so wronged about...

So, after quitting as a police officer, that officer makes a disclosure.
"The incident that caused trouble at a specific point in time is the part the police officer feels so wronged about. Because that was when the police officers caused the accident."
Do you know what this means? They sent a dog-like report to the Blue House regarding an incident caused by the Busan police, all to ensure this person couldn't do anything. The President also believed only what the police said and thought this person was a bad person.
In other words, this was actually an incident that the police failed to recognize. In December 2015, they failed him in an interview and drove him to develop schizophrenia; he then suffered from extreme depression. They were trying to kill him back then, and at that time, they almost killed a woman in an incident the police failed to recognize.
If this situation had exploded, it would have been a massive scandal caused by the police breaking out in the media. Even the Blue House knew about this at the time. They knew an accident like this would happen.
They almost killed a woman that the police truly failed to recognize.
And after all that, they say they were told to "kill everyone" because the investigation is finished? ^^
If this happens, the Blue House will essentially wipe out the Busan police.
To argue about the results of your current actions is secondary; the fact that the police caused a massive accident is much bigger.
Try releasing this to the media. Even the President won't be able to offer a single word of excuse.