He doesn't write "blame". But if you thought that was the cause, and you want to eliminate that cause, what else can you do but tell the people who did it that

He doesn't write "blame". But if you thought that was the cause, and you want to eliminate that cause, what else can you do but tell the people who did it that you think it was the cause and they need to do it differently? And even if you handled it as gently as possible, would you still not want to go and apologise if you found out you were wrong?