This looks like a serious writing and I do appreciate Rahe. It deserves a serious analysis but I'll give an off-the-cuff comment now just the same.
Rahe's premise in saying "Liberty requires a responsible citizenry" is that if an element of the citizenry is irresponsible some other element will step in to save them from their anti-survival behavior. But what if those who didn't preserve themselves were allowed to perish?
I'm not suggesting this as public policy (yet) but as a thought experiment.
My snappy comeback was in a similar vein. I -- and a bunch of those wacky libertines at Reason -- would rather address the interstice of the behavior and the need it creates. If you can support your own kid, I'm pretty squeamish telling you you have to have a marriage license.
By numbers, Rahe (and Gov. Huckabee and Senator Santorum) is right. But I want to be allowed to do things that are statistically suspect. Perhaps there is a cultural role in Toquevillian values but I cannot accept a government one.