A few dozen long-time moderators vouching for the one that was fired and stepping down should inspire some doubt. Personally, vague judgements that say "she totally, repeatedly overstepped the lines, and didn't want to change after we confronted her, but we won't comment on issues like these" always sound fishy to me. If they won't comment, they wouldn't have commented. It looks like "we're inventing reasons that make people shut up about it because we don't have an actual case that we could present".
