When first-year university student Henry Nowak was slaughtered by a foreigner named Vickrum Digwa in the streets of Southampton, England, late last year, the indigenous people of Britain — which is to say, the white people — finally began to rise up. And as they learned more details about the case, their anger grew. Henry Nowak had been stabbed simply because he passed a Sikh on the sidewalk, noticed the large blade hanging in front of his clot…