Those dastardly Danes!

 Or, the real reasons Anglo-Saxons hated the Danes (Vikings)

 "One thirteenth century chronicle attributed a slaughter of Danes by Anglo-Saxons in 1002 to the former’s irresistibility to the latter’s spouses: ‘The Danes made themselves too acceptable to English women by their elegant manners and their care of their person. They combed their hair daily, according to the custom of their country, and took a bath every Saturday, and even changed their clothing frequently, and improved the beauty of their bodies with many such trifles, by which means they undermined the chastity of wives.’” – Erik Wade at maggiesfarm.

The killing and plundering might have something to do with Anglo-Saxon/Viking dislike as well.