I agree with your last paragraph. However, Venice attacked and was attacked multiple times throughout its history, even during the times of so-called enlightenment. I think what you’re describing is a great ideal and should be worked toward, but I think we would be remiss if we didn’t plan on experiencing problems in the meantime. Those changes won’t occur overnight, and during the transition phase, pirates, not to mention nations or international governments (which grow more and more powerful all the time) may want to either stop what we’re doing because they recognize the cultural threat, or may want to participate in what we’re doing by force because they recognize the benefits to be had. Those are things that are outside of our control.
Example: Say everything goes through as planned in French Polynesia. The seastead gets built by, say 2025. Over the following 10 years, scientific advances come out of the seastead that far outstrip most if not all other places in the world because of the unique mindset of people attracted to seasteads and also mostly due to the freedom granted by the special economic zone. A few things could happen. It’s possible that the world lauds our efforts and the seastead becomes a pillar of light and truth and freedom etc. I hope that happens. It’s also possible, and in my opinion more likely, that one of the following two things happen. People become upset because maybe some of the advances discovered violate traditional close-minded ethics, like stem cell research or something, and try to use force to shut us down (which has happened all over the world more times than I can count). If that happens, it would likely be the power of a state or international government trying to do that. Perhaps even France itself. Or, people would see how rich, prosperous, successful and etc. we are, and want to take advantage of that themselves. Either people will try to do it through legal processes and use the power of the state, or there will be risk of pirates. In fact, because of the advanced technology of the seastead, pirates would have to up their game, and could become more dangerous than they are now.
This is all hypothetical, I admit.