why?

this is life, this has become a law of nature, the strong oppress the weak, the majority of the minority to corner. do not they realize if we are the same as born with naked and when we die just bandaged a shroud. to whether they were hurting each other? Is life only belongs to those who are the majority and the powerful? Only god who knows. how quiet this life if we cared about each other, why god created the good and the bad? Is this what makes someone a benchmark of faith? Then why can not we live together in harmony? If we still believe in the existence of god why do we still do evil, but still a lot of good things we can do. god gave us a conscience so that our fellow human beings have a bond for our fellow human beings do not hurt each other. God will be pleased if we love one another god even promising paradise to those who do good for others.
But why do we still hurt each other? Is not this life will be peaceful if we mutually do good to others??