As long as the "groups of people" Harm no one in doing so, they should be allowed.
Given a locale where some such people already live,
we can achieve this in a very peacefully.
They harm each other, but harm no one in setting it up, the initial generation is voluntary, their descendants will be in a society that actively harms without a possibility of escape.
Perhaps I tragically misread your question.
That sounds like a real problem seen previously in communes set up in the USA back in the 1970s.
I will reply again to the original query.
