bursting into tears

Last night, my grandma and I were sitting in the same room. I was making a flower by crocheting when my grandma started telling me about life in the past in our region (Kurdistan). She told me about the time when the enemies of Kurds were attacking them in 1991.
She told me that while I was cooking, all the people were escaping and she couldn't understand why. She had some animals too, so she started to escape with the animals with her. Her children weren't at home, she said. She just ran and didn't know where to go. Bombs were everywhere, dead bodies lying on the ground, soldiers everywhere........
She eventually reached a village and found a few of her relatives. She said, while I was pouring tea into a cup, a bomb had destroyed her neighbours house. THANK GOD she's alive.
I really wanted to burst into tears. I can't retell the crisis :(
But my point here is: why don't we stop fighting each other? Why do we hate each other? Why don't we live a peaceful life? Why? Why? Is there anyone who can answer me???????????