Going from "current mainstream culture is not perfect" to "there should be more experiments in alternative ways of life" requires the assumption namely, that the average experiment is more likely to improve matters than to make them worse. When these experiments go awry, they hurt not only the participants of the experiment (who are themselves often children or others who have no other choice), but also everyone standing nearby.

I don't think the current nuclear doctrines are anywhere close to perfect or best possible. There is surely room for improvement. But I vehemently oppose more countries innovating on nuclear doctrine, because the average outcome of innovation is likely to be worse than the current equilibrium, for bystanders and innovators alike.

Medieval Europeans knew that the fallow-field system was imperfect, but many simultaneous experiments on alternatives would have led to famine, not viable alternatives. Careful experimentation in some monastery gardens is a good thing, but wagering everyone's supper on untested ideas isn't.

The same applies to our own civilization. Western capitalist culture has flaws aplenty. But this does not mean we should throw open the gates to every, or even any, alternative group that comes along.