Averages are made of extremes. Boys do better on standardized tests; they also predominate the prison population. The average (middle value) is about the same for males and females, but the extremes are further apart in males. As political scientist James Q. Wilson once said, "There are more male geniuses and more male idiots". It isn't a plot or a "vast right-wing conspiracy"; it is natural variation, of which males seem to have more.