To be a little more constructive in my criticism (I echo your points about corporations and the re-emergence of nations) - I think it's worth thinking about what a nation state or a European state provides...

At heart, one of the positive things size provides is a pooling of risk. If you're a city state on a river and there's a big flood, it could knock your economy into the sewer for a generation... but as part of a nation, there may be resources to rebuild, transfers from the national tax pool. Of course, in return, you have to contribute to the pool too, which always upsets the glibertarian tendency... but it applies beyond accidents to infrastructure and more...