<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
What would possess humankind to kill so many people in wars?
<|assistant|>
Wars are often driven by a desire for power or resources, nationalism and pride, or religious and cultural differences. People may kill in the name of a cause or belief or because of injustices they feel have been done to them or their group. In certain cases, wars are fought in retaliation for an attack by another nation. In most cases, it is a combination of factors that drives humankind to commit violence on such a massive scale.