I'm not sure passionate is the word I would use to describe the debate. I think most women recognize that there are innumerable variables each family weighs in figuring out what is right for it, and the balance scale tilts at least ever-so-slightly in one direction.
Thus, I think the debate is more an internal one, because no matter which category you are in, you are constantly weighing whether you are making the right choice. I think what happens is that as women weigh where they stand, whether they're debating quitting and going home, or wondering when would be the right time to go back to work, they find themselves judging the families around them. We live in a competitive culture where parents want to give their children the best chance at success. There is research that supports both dual-working and at-home parenthood as the better model. It makes sense to me that each family's decision could be right depending on what fulfills its individual members. I read in a book that whether you are a career woman or an at-home mom, your role is not as important as the attitude you communicate about that role. That resonated so much with me. So I think we should stop trying to seek outside justification for our choices (something that could cause passionate debate), and take pride in the paths we've chosen or the hands we've been dealt. If anyone out there is passionately debating with others about this, remember that one woman's conviction to be at work could rightly be as strong as your conviction to be home and vice versa.