We can first start with "Countries". Through the ages Nations usually fight over one of two things, 1. Land or 2. Religion vis a via the current war by Russia. Religions have been a significant cause of wars. Also there are hundreds of reasons that humans set up selfish justification benchmarks for their existence. All of these cause anything from minor to very significant personal reasons to behave badly between each other. We just had "women's day" and how much better women can be from men, Religions has led to wars through the ages. Of course politics plays a significant role in this game of who is better. You also have rich vs poor. In net we are driven to prove we are better than the next person/group and this leads to the society we live in today. The reasons is because we either want what the other person has or believe their beliefs are wrong and misdirected and we want to change them. These are age old problems which have
led us to live in the mal functioning world of today. These theories can continue to be expanded but I'll leave it here.
