It is good to see people pointing out that he made a decision/choice, not a mistake. People use the word "mistake" to take the edge off of bad behavior. But there is a big difference between doing something by mistake and deciding on a deliberate course of action.
Misspelling your name on a form is a mistake. Putting salt in your coffee when you meant to use sugar is a mistake. Visiting prostitutes for years behind your wife's back is NOT a mistake. Being an obnoxious jerk to people is NOT a mistake. Those are revelatory behaviors. His livestream was a mistake. Thinking he could bully Kim into silence was a mistake. Being a greedy douchebag is NOT a mistake. Sexting women behind his wife's back is NOT a mistake. With enough examples, I think we can make the point clear.