I have a number of problems with your post. I will be addressing it as if you were trying to make an argument instead of asking a question (which is what you were doing). Your argument seems to be (and correct me if I'm wrong):

Liberal policies are better than conservative ones because all these countries have liberal policies. We know they have liberal policies because they have nationalized healthcare.

• Your basic premise is not logically consistent. It's an argumentum ad populum. Whether liberal policies are better or not, your conclusion is not supported by your argument.

• Nationalized healthcare is not a good indicator of overall policy. I will use economic freedom as a measure of conservatism/liberalism in policy. Countries that rank highly in economic freedom would have generally "conservative policies, such as low regulation and government intervention, free movement of capital and labor, free trade, etc.

Four of the countries you mention - Singapore, New Zealand, Australia, and Switzerland - are among the top 5 countries in economic freedom. The majority of the others (Canada, Denmark, Britain, Estonia, Germany, Japan, Netherlands, Sweden) all rank very highly in economic freedom, between 70 and 80 (the US is a 76, for comparison).

Here is the list I used. If you don't like it, here (tables and charts, opens in excel) is another list that happens to be peer reviewed. If you don't like either of these, provide another one. If you don't like economic freedom as a measure of policy, feel free to argue that as well.

• You don't make any effort to demonstrate causality between the policies you advocate and the desirable qualities of your example countries. You don't consider other things these countries have in common - relatively homogeneous populations and relatively small populations. You don't consider their natural resources. You don't try to argue that your policies cause prosperity, and not that your policies are a product of prosperity. You don't try to argue that your countries are more prosperous than they could have been with a different policy. These are all things we must consider before we can make an educated judgment on the matter.

• The countries you listed aren't necessarily doing well. Spain, Ireland, and Italy (notably, not among those ranking highly in economic freedom) have all experienced a great deal of economic instability in the past few years, at least partially due to their economic policies. Yes, they are not a majority, but their existence suggests that these policies do not work for every country that institutes them.