But think about this from Google's standpoint. As a search engine, Google can't tell what parts of the world you are blocking from accessing your site, at least reliably, and Google may not have a system in place to filter out your site from the results when people in those parts of the world run searches.

Google has stated repeatedly that their goal is to provide the best possible search results, and avoid users from clicking into an error message. If IP filtering is perceived by Google to make their results look faulty to those who are blocked, would you not expect them to take action, up to dropping the sites that do this?

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The best way to learn anything, is to question everything.