It's sad that libertarians / ancaps are bullied out of the real world to do their experiment. These kind of experiments should be done on land.
Uhuh. Though they just call that "thinking".
There is no "real world" form of utopianism. It's a dangerous adolescent form of thinking which requires purifying one's environment until it is All Good according to a single set of criteria.
All society-level attempts at this measure their results in millions of deaths.
All change is plural and incremental, even so-called "revolutions" really just exchange the set in power for another set. They leave the plurality of really-existing power structures in place, whilst disturbing only a small number.
This is simply an incremental shift in power at the very top.
Utopian projects take pluralities of lifestyles and pragmatic political systems and attempt to unify them under a single consistent set of criteria.
It's something for the mind of an adolescent, to which this mode of thinking is common.
Society cannot be characterized by a coherent set of ideological principles. It is the behavior of human beings, which is highly plural and inconsistent when formalized.
There is no ideology to "leave in tact". By destroying the government you do not "uncover" some latent capitalism, you take the ways everyone is behaving -- have them repeat that behaviour -- but now without a government.
You'd find that to be a catastrophe.