There is not much I could add; Serenity told the whole story.
Actually, every community, whether small or big, is exposed - at certain moments - to conflicts, lesser activity, slow reactions, technical problems, and, of course, to attacks by trolls, pranksters, spams and scams, but it is, in general, easier to maintain peace on smaller sites, as far as their administration does a good job.
I think that things improved lately, and it is really nice here and also on Amrt. As I was already on too many other sites, including professional contacts, I could not join Blrt. and Anmg - lol; time is much too short to deal with more than 4 - 5 sites - and there is always some correspondence waiting.