BTW, the English "mixed" with the natives at the same rate as any other group. Englishmen, after all, are not sexless, nor, reportedly, are they built differently than other men.
It was more taboo among the Anglo-Saxon Protestants after all many of them were Puritan and Quaker religious fanatics. The Anglo-Saxon Catholics and Scottish Catholics and Scottish Freemasons were more likely to mix and less likely to murder than the fanatics.
I don't ever expect the Anglo-Saxon Protestant Historian to tell the truth regarding the crimes of their forefathers. They would prefer to blame disease than face the facts. The Anglo-Saxon Protestant likes to think of himself and his values as morally superior but History discredits that idea.