Not under Ronnie, which is what you said. And there was never a time we "couldn't fill one stand", even for dead rubber games.
No idea about broken chairs in September, I missed the game due to being in Riga. Maybe there was loads though, and Kilmarnock just forget to mention them because they won.
Same with the smoke bombs last season when Killie won 1-0. Obviously these thing are only dangerous when Celtic win the match.