I was going to make exactly this point. Very few ideas get to 100% on their own, but it's obvious which ideas are winning and which are losing at most given times. A policy can be implemented more strongly with state power, but state power selects for ideas that pass the political sausage-making process, not for ideas that are actually good or right. Capitalist success is a much better filter for idea quality than government is(in large part, because the sorts of people who run governments tend to be ones who pick a few values to elevate and lose perspective on the importance of others).