Why would I clobber you? You seem to see this strictly in materialistic terms. The reward of a mother/wife for assisting her husband and family are worth more than any retirement fund. Yes, society ought to value more the contribution of mothers and wives. They used to--indirectly. At one time, a man could hardly be promoted unless his family life was solid. Nowadays, society punishes those who place family first--men or women, and rewards those who put the company first. I am the first one to say that isn't fair but it is the name of the game.
Let's assume that you can wave a magic wand and force companies to reward men and women equally, regardless of how much time they devoted to the company. Do you really think it would help? I think it might help those already employed by the company but I think it would also dry up the future job market for women because they will be perceived as often less productive over the long haul than the males. Think of it this way: given that all other options are equal, would you drive a car that gets 15 miles to the gallon, or 22 miles to the gallon? And would you want the government or society to force you to drive the 15 mpg car just to be fair to the makers of that car?
Fairness has to be economically justifiable or come from within or it is unenforceable except through coercion. I will take the rewards of motherhood and wifehood than anything a 401k could offer me. Which, by the way, is exactly what I did.