What ails women's reservation bill?

Why are the leaders of the so called democratic parties holding a whip in their hands against any reservation for the OBC and Muslim women within the 33%? Why didn't the women protesting outside the House during the discussion on the WR Bill demand any reservation for the OBC and the Muslim women? Or even differently abled and such other category women? Why were some media barons worried about the rotation system as if it was some invention?