What is the danger of group egoism?

In the fact that any person who said something to them in response, they can either humiliate him publicly in order to supposedly be respected by others for this act.
Or, problems in the family, for example, a mother asks her child to help, but he will refuse and will do his “important things” while sitting on the Internet or communicating with others. This is selfishness, and with all this, the mother will have a different impression of her child, and it may even drip why and how it happened.
And egoists will still answer without thinking about others and their feelings.
Here’s another example. On the street: A stranger comes up to the girl and asks to say what time it is.
Since this girl does not need anything, and she does not care about the man in front of her.
She replies: I don’t know. Although she holds a phone in her hand and has a watch on her hand.
And we do not know how a person with psychology is, everyone reacts differently. They can then do something to her because of this action … It seems silly, but anything is possible. This is life and not a game of priorities.