Hatred is a fire that if left unchecked will consume all those it touches. Adding fuel to a fire only increases it. Not supplying the fuel will cause the fire to burn itself out.
If we keep fueling the fire of anger and hatred with thoughts of self-justification and self-benefit, of bitterness and resentment, we will never let go of our anger. Eventually, it will consume and destroy us all, for those who are surrounded by fire will inevitably be burned.