Its simple when there is positive power the negative power automatically exist to make the balance.
In a same way that to make the balance of things both power exists positive as well as negative, where there is love there is war.
Same as god exists where as evil exists to make the balance of the world.
And we have to decide what we have to do.. to make evil and do bad things and make others suffer from it or to follow god and help others and make our society, country and world peaceful.