Guys and gals, I found an article on Psychology Today and how @@Rive pointed out, there have been many researches on this issue that may explain explain all the points you all have brought up.

I guess may of you already knew about !!! bystander effect!!!!! only knew a few about it, to be honest, that’s why I was so bothered and shocked when all these people didn’t dare to help my neighbour.

This is the article about the bystander effect:

Bystander Effect | Psychology Today

Maybe in the case of my neighbour as there were many people having dinner, they decided all to put the responsibility on the waiters. Or on the others.

On another side, unluckily, one of these variables that intervine and try to explain the bystander effect is the how to call it, kind of judgement, for example if the person in trouble is a person who has drunk, we tend to blame the person (I know it, stupid as hell but understandable) and my neighbour’s mobility is a little reduced and sometimes he lost stability so people may have thought he was drunk. He even recognised me that it may be the cause in our second conversation about the issue.