The ability to treat deadbeat husbands, especially dads, as criminals is a great reason for the state to enforce the terms of marriage. This is just nuts and bolts of civilized life, or should be, if we weren't so fixated, collectively, on individual gratification rather than individual responsibility, to the extent that we don't even know what marriage is for.
Feminism defined as more women having career available to them is fine, but not when it takes away the option of devoting themselves to child-rearing. A woman should not have to stay in the workforce as a protection against the husband abandoning his responsibilities - society and the law should provide the protection.
Your opinion to which I mostly agree with fails to point out that the women back in the 40's and 50's did not have the rights and opportunities like we have today.