Recently I was around a physical bet shop close to my area and I observed a man who was shabbily dressed walking in the gambling house. I got into the place to observe what his intentions were. He walked straight to the gaming attendant, placed his bets in a highly coordinated manner and quietly walked out of the physical gambling house. From the way he was well organized, you will never know that he was mentally unsound apart from his dirty clothes and unkept hair and beard.
When I inquired from the attendant, she said he was a regular customer and that he usually raised money for gambling through the manual jobs he does around the area. She also told me that he has never misbehaved and acted violently in the gambling house so she was comfortable with him.
My question now is are there any moral, ethical or legal obligation to bar a person from gambling after physically observing that he is mentally unstable?
In essence, when he does not do negative actions then of course there is no obligation to prohibit him, unless the person makes a mess or other negative things that make other users uncomfortable then maybe the casino will also prohibit him. But anyway, the reality is that so far the person is fine and the people around him and even the casino workers do not feel uncomfortable, so there is no need for you to judge badly just because the person is not neat as you mean. After all, it is better for someone who looks bad but lives peacefully, than someone who looks neat but does negative actions when he loses gambling, and that is worse.