I completely agree. One might even argue that idleness would also give well-meaning people the free time necessary to work on effort-intensive community project

I completely agree. One might even argue that idleness would also give well-meaning people the free time necessary to work on effort-intensive community projects that might help mitigate the problems the comment above mine was concerned about in the first place! But humans are tricky creatures, and I can see how it might turn out poorly. I think community interaction, events, and promotion of constructive activities (opt-in and minimal government interference, of course, we still want to maintain freedom of ideas) would be a very important part of any pro-idleness society.