The one thing we know for sure is that there is no "norm". It's easy to form an opinion about most anything, but be careful. Watch out for generalities and always think about those situations that are not necessarily top of mind.
When thinking about a working mother, the assumption (and we know that assuming is risky) could be that there is also a working father. But I have friends and family who have been extremely successful in raising children with a working mother and a stay-at-home father. Good for them!
Working Mother just published an article about how a custody fight could be more challenging for a working mother when the father is stay-at-home. Scary. For me, there is still something beyond it all when I see the bond between mother and child.
I can understand both sides, but based on your point of view, it can be very troubling.