The correct answer to this open question is the following.
Humans are complex beings. Every human has a different mind. When people are part of a society, they have to relate to each other but that doesn't mean they have to agree or like each other. And that has been a major problem. Why? Because people do not understand either respect differences. Seems like "if you do not think like me, you are against me." And that is incorrect.
People need to appreciate the diversity in life and other ways of thinking because diversity makes life fun and interesting. As noted in "To Kill a Mockingbird," the color of the skin, the name of your family, the territory you live in, or the belief system you process, have always rivaled with other people that have a different situation.
Today, our society deal with those differences by making their voice heard loud and clear. However, many people still acting as if they were living in the 1800s. Dividing instead of uniting. Selecting, instead of including. Segregating, instead of accepting.