You paint with far too broad of a brush. If my wife wants to work, I will support her because that's what a relationship is about; love, trust, and supporting each other. How great of a marriage do you think I'd have if I told her "No! You can only stay home and watch the children!"? O_o
It has nothing to do with helping my wallet; it has everything to do with supporting my love and helping her to realize her ambitions. If she wants to stay at home, that's fine. If she wants to work, that's fine too. I would never try to limit the role of a woman simply because "that's the way it should be."
And I plan on trying my hardest to be the best father I can be. Which means MUCH more than simply bringing home a paycheck. I have no problem with focusing on multiple tasks, thank you very much. Again, you generalize too much.
Your anecdotal "evidence" about how traditional gender roles somehow lead to better marriages or more well behaved children doesn't really mean anything. I could give you dozens of examples of happily married couples where both husband and wife worked while raising their children and everything turned out great.
My own parents, for example. They will be celebrating 34 years together this November. My mother was the vice president of a bank while raising my sister and I. My father worked full time in construction. I had a terrific childhood.
As I said before, being a good mother (or father) and being a working woman doesn't have to be mutually exclusive; a woman can be both if she desires. However, being a good husband means standing by your wife and supporting her decisions and desires, whatever those may be.