Rational Voters

I haven't read the whole book, but I read through Bryan Caplan's Cato policy analysis essay based on The Myth of the Rational Voter, and I have to say I'm a bit puzzled. The conclusion is that the solution to voter irrationality is libertarianism -- "A better understanding of voter irrationality advises us to rely less on democracy and more on the market." So far so good. But the argument that voters are irrational turns out to substantially turn on the claims that voters are irrationally averse to adopting libertarian policies.

I don't really get it. What about my political views is supposed to change in response to this insight? There doesn't seem to be anything here that would count as an independent reason to favor more libertarian policies than the ones I already favor.