> Counterintuitively, America’s lack of a generous welfare system tends to destabilize traditional gender roles.

I don't think that's so counterintuitive. Generous welfare systems give more people the opportunity to pursue the work lifestyle they would like to rather than the one they would have to to make ends meet if the generous welfare system didn't exist.

That's a totally different scenario than gender roles being enforced by religious or cultural restrictions. That also promotes traditional gender roles but doesn't give individuals a choice in the matter.