Simple. So that they don't have to admit that women are equal.
Steve Chapman wrote this fine column yesterday at TownHall. It demolishes the fantastic lie that women are treated less than equal in the arena of pay. Read it FEMINISTS you might learn something.
But be reminded, EQUALITY is NOT what FEMINISTS are fighting for anyway. Equality is a biblical virtue, and one that every Bible-thumping Christian has always held to. SAMENESS is what the fems are after, and sameness is a bastardized substitution (and a poor one at that) for equality.
The modern day FEMINIST movement (since 1960 forward) really has absolutely nothing to do with parity between the genders. It's just a back door entry for the homosexual activists to move in on the picture of traditional (i.e. biblical) families.
And when I point these things out as I did in my new book, and in my column yesterday - it tends to make the moonbats really, really, really angry...