Selfishness causes war
In a war, somebody will lose.
The soldiers will be injured, the victims will be tormented and lives will be lost. People will starve and children will lose their parents. No one really wins in a war.
But if war is so bad and no one wants it, why does history repeat itself? It’s because of our selfish nature. A war can easily begin with a careless thought that tells us that our needs are worth more than others' lives. It's hard to understand why some people are ready to sacrifice the life of others to satisfy their own needs.