BACK TO THE DRAWING BOARD WITH ROSS DOUTHAT. Ross Douthat's Times columns are barely worth the effort, but I suppose I have something to say about his latest. It's about a "provocative paper" that shows that women are unhappier since they got liberated. Douthat says we shouldn't make too much of it, though -- except to agree that women need more help raising their kids, and the best way to achieve that, he's sure we'll all agree, is to create "some kind of social stigma" for single motherhood, but a