Why do people fight?

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Imagine the people have got all the resources available, would they have fought ever to each other, or just enjoyed. Sometimes a person or a group of people interfere into others interests for any reason, the culprit feels injustice and oppose in some way- Instantly if he is capable to handle them or if he thinks so. OR, after some time when he realizes. If the initiator would not have created the problem, the world would have been peaceful. Am I right?