An answer to the particular criticism you raise would involve going into far too much detail here, I’m afraid.

The core of it is that you implicitly rely on conceiving of autonomy as a deontological constraint of some sort; I argue that it should be thought of teleologically, as a valuable property which we would like people’s lives to instantiate. The full answer follows from that with some moderately competent philosophical spadework.

The practical policy issues you raise are good and interesting ones, and I’ve got lots to say about them (though I hadn’t realised, till I reread the last proofs, how skeletal my treatment is in A&L – lots of work to be done in getting it all explicitly down on paper). I agree with Peter that Routledge are charging far too much for it, so I don’t suggest you buy it yourself, but why not ask your friendly local public library to get a copy? Then you can write a devastating rejoinder.

I will say one thing: in no sense am I a libertarian.

Assuming that everyone is as responsible person as, say, a typical student of Cambridge, this political theory works just fine.