Hello, everyone! My advice and practice is to write to everyone the way I would like to be written to: positively, encouragingly, and if corrections are necessary, presented in as positive a tone and words as possible. I also believe in opening with a cheerful and respectful greeting, just as one would do if speaking to someone for the first time. As a closing, I also like to include some well wish to the recipient. We all do that in normal conversations whether in person or over the phone, anyway.
On the issue at hand, by sending the addresses of all copied individuals, the original sender was telling everyone who all was in on the confidence and implicitly creating an audience for any follow ups.
When one of the recipients saw the need for correction, it was understandable that this person would want everyone on the list become aware of the correction.
The best way to avoid such happenings is to do what has already been suggested by several postings: use the blind copy line and thus replies can only be sent only to the original sender.
Good day to all,