Citing several small countries with many significant differences from the U.S. isn’t solid logic. All of those countries are much smaller, much less diverse, and enjoy the geopolitical shelter of the U.S.
Are you suggesting that a country needs to take away press freedom as its population increases or it becomes more diverse? Otherwise I don't see your point. I can concede that economic freedom might become more complex for larger countries, but why shouldn't press freedom scale? We rank in the 30s and 40s on those press freedom indexes. If you want to eliminate smaller countries, why can't we keep up with a country like Germany who is ahead of us on both lists?
I don't think the suggestion is that a country "needs" to take away freedoms as it grows larger or more diverse. It's just that a larger and more diverse country is simply more likely to have to grapple with tensions between different groups of people. This may lead to some freedoms being challenged.