What, then, is prompting the murders?
He attributes it to the "hatred of women" (though not, of course, the misogyny embedded in core Islamic texts).
Update: The WaPo reports that at least 1,000 women die each year due to "honour" killings in Pakistan:
It’s the year 2014. Why is this still happening?
Some Islamic fundamentalists think that only through the murder of an offending family member can honor be restored to the rest of the family.