There is a book that contains a message of hope. It says that if you live your life a certain way then good things will come to you. All that you have to do is believe in the message.
Many people have read this book and gained faith. They live their lives according to the message and they are happy. Good things happen to them and their happiness is contagious.
In the usual nature of things every now and again a person reads the book and finds a different message. They understand the way to live but they cannot find happiness. They do not see why everyone is not living this certain way and it begins to upset them greatly. Soon their dislike for all other ways of living turns them sour. Now they hate everyone not like them, sometimes even those who are living according to the message and are happy.
Hate is a powerful emotion that is hard to shake. It festers as prejudice and explodes as anger. Occasionally such hateful people are so angry they resort to violence to calm their senses and their faith justifies any action as just.
Time passes and people all over the world read the book with its well-written message of hope. Millions of readers adopt the certain way but there are a few who misunderstand and let hate develop and take root. As the message spreads about one third of all inhabitants at any one time are living this message of hope.
Now suppose that when the book was written there were only 100 million people around to read it and perhaps only a few hundred individuals who misinterpreted the message and became convinced that all non-believers deserved to die. These troubled souls were spread far and wide; they did not speak to each other and felt isolated and alone.
Today there are 7,520,642,839 people in the world. There are tens of thousands of misreads when readership is in the billions. More than enough people to talk amongst themselves and get organized.
They decide to convert everyone to their interpretation of the message. For them purity is important and there can be no other interpretation than the one they have. Of course very few people listen because the certain way has made them happy and there is no room in it for hatred.
The misreaders become more and more agitated. They plan actions that will make everyone listen and they embark on a crusade, a trek to the place where the message began to make people listen, with force if necessary. As they gather to demonstrate they clash with police. Many are injured and some killed from both sides of the readership. It is not long before the violence has escalated into a all out war that the misreaders have no hope of winning being small in number and lacking resources compared to the majority.
The misreader leaders are captured and put on trial where the majority convicts them of crimes against humanity. It is messy and levels of happiness decline.
In a substantive way the book and its message are depleted. The book is still read and the message of hope heralded but every now and again a misread still happens. The accumulated history of misreads have asked a question that some among the faithfull find disturbing. It takes only a little while for a new generation of misunderstanding to emerge and organize around a hatred for the certain way and a cycle is born.
Game theory explains it and a human tragedy is created by it.
And just to trick your brain out of its innate prejudice, remember that the book is the bible.