Exactly. As Kevin even admits later in the article, their list of allowed vs. not is determined chiefly by the observed side-effects on already existing relationships, attitudes, etc, which they put high importance on.
Yes. Their communities are naturally limited in size (since they meet in their own homes and barns), so they are probably very responsive to the needs of the specific community. On top of that, everything is voluntary, and rule-breaking is handled non-violently.
