I mostly agree with your points in this thread, but this statement might be incorrect. Earlier, Swedes with X income did not choose paternity leave. Now Swedes are given X+leave benefits and therefore do choose paternity leave. Although they were always free to choose, it might be the extra bonus that nudged them into taking the leave.

Also, people are not economically rational. They will blow all their money and then, when they have a kid, not have enough to support themselves for an extended leave. Few people have the self-discipline to save for anything in the distant future, including retirement.