The answer would be they evoke an emotional response from readers.
The answer to this question is ion
Think of ways that you do things that other people do things differently than you.
Religion- different religions celebrate different holidays, different services (like church), some people aren't religious at all
Backgrounds/cultural identity- people come from all different places, some even from other countries. There are things like languages and foods and traditions that come with it
Social cliques- People tend to talk to those who are most like them, so there are different groups in environments of different people.