But it outlines the fundamental flaw in thinking that a system should be judged "fundamentally flawed" if it cannot succeed on a microscopic scale when surrounded and technically governed by a much larger and diametrically opposed (if not outright hostile) system.
This assumes said "larger and diametrically opposed (if not outright hostile) system" would know, much less even care about your system. As long as you follow the laws and pay taxes, the larger system will not care (Austraila has lots of micronations that they don't crack down as long as they pay taxes, for instance, and the US has several micronational projects too). The whole act of an autonomous zone is to test your ideas, away from the system, paying nominal loyalty to it and obeying its laws, but carrying out your own reforms within your zone, to prove your ideology can work.
If you don't like living there, then you could desire to be fully 'indepedent', but I prefer having the experiment be easy to do, rather than focus solely on trying to get indepedence without actually implementing said ideology and seeing if it works.
The fact that such a system fails once doesn't in any way prove it's fundamentally untenable.
That may be true, but if you believe this is true, you need to repeat the experiment again, this time ensuring that the cirmustances are more 'favorable'. If you want, you can have more and more experiments being done, having more "data points", then compare and constrat, seeing how many systems 'failed' or 'succeded'.
I can't see how one can propose a ideology without having any experience in showing that this ideology actually works (or, more accurately, how do you 'implement' said ideology in the correct manner to allow for a functioning community). I really can't. If it can work, it should work. And merely believing in an ideology without any proof whatsoever, to waste valuable time and resources to promote something that may not even be true...that is far too risky.
I mean, hack, I know people state that some ideologies might work only on the micro-level, and not on the macro-level, but to state that an ideology might not work on the micro-level, but work on the macro-level...well...
EDIT: I did some discussion with other people. It is true that just because a community fails, it may be due to other reasons. I still hold onto the belief that if more experiments were done, we will be able to conclude how successful such an ideology would be. Oh well, meh.