Hate the sin and not the sinner' is a precept which, though easy enough to understand, is rarely practiced, and that is why the poison of hatred spreads in the world.
I become more than ever convinced that it was not the sword that won a place for Islam in those days. It was the rigid simplicity, the utter self-effacement of Hussein, the scrupulous regard for pledges, his intense devotion to his friends and followers and his intrepidity, his fearlessness, his absolute trust in God and in his own mission. These and not the sword carried everything before them and surmounted every obstacle.
Children inherit the qualities of the parents, no less than their physical features. Environment does play an important part, but the original capital on which a child starts in life is inherited from its ancestors. I have also seen children successfully surmounting the effects of an evil inheritance. That is due to purity being an inherent attribute of the soul.