Dear Fiona,
What has happened has happened - and, who knows, perhaps in years to come the upset family will really appreciate having the information you have given them.
If you had agreement from each person who provided an oral history that a transcript could be provided to other family members then that is that. And if not, well - it's happened so all you can do is apologise and then put it behind you.
And sometimes it's not even your own responsibility! My niece and I were very unpopular when the ages and addresses of relatives appeared in a report commissioned by a distant relative and carried out by an independent researcher. Unfortunately, the researcher had acknowledged out contributions - but what we had provided related to long past events in distant countries. However, we were blamed for providing the birthdates and addresses of living persons - which we had (quite meticulously) avoided doing! The birth dates of the relatives (they were quite elderly) were found by the researcher in the publicly available birth indexes and the addresses in electoral rolls!
Try to stop worrying about something you can't change,
Regards,
JAP