We are talking the 1960's and 70's. Womens libe was much bigger then. Women thought that having a career was the way, and they were VERY hard on SAHM's. When my mother talks about it, you can see that it STILL hurts her today the way these women treated her. It has gotten so bad, that now that my mom is alone and living very well on my Dad's pension and 401K, she feels guilty about USING any of this money, as she feels that she did not "earn" it like these liberated women. I have to explain to here that her raising the family and running the house allowed my Dad to spend more effort on his work, and thus to advance very high in his company and GET the nice luxuries.
What I do see today though is a slight trend the OTHER way, I have seen several women GIVE up their positions at my company so that they can become SAHM's. I love to praise these women for what they are doing. Raising kids IS the toughest job there is.