Answer:
If you mean him, it is because he is mentally insane and he really was a mental hospital patient. Also the following information is provided.
He was no longer Arthur Fleck. No longer trying to be nice. There was no attempt to defend himself and explain that those 3 men harassed a lady and assaulted him. They could’ve killed him, and he’d be right – the press would move right on to the next piece of news.
He ended the interview by shooting Murray Franklin on live TV, destroying his father figure and a symbol of his dream. The last connections to his old life. Then he throws the gun on Murray’s table and did a little dance.
Now, he’s really free of Arthur Fleck. He’s Joker.
As he was taken away in the police car, he fantasizes about being celebrated by the people.
In the last scene, we see him talking to a psychiatrist in a white-walled room. When he walked out of the room, he leaves bloody footprints in the hallways of the hospital.
Explanation:
I have a sister just like him :(
