Have a rule-- I detest it (though not to the point of banning people) when someone mentions something they saw online and doesn't offer a link, or at least apologize for not having one.

That's a strawman. Nancy said "last straw". It wasn't a single comment that caused the ban.

This community doesn't suffer from being overmoderated. I think it's worthwhile to have a moderator who is in the position to moderate when they think it's necessary to do so.