Ability to delete contacts from DNM in bulk is definitely something that would help in case of an emergency like an accidential import into that DNM list.
Further to the ability to delete contacts from the DNM based on a CSV import, we need to also consider the downstream impact of the accidential import in the first place, which is the subscription status of any contact who was accidentially imported to the DNM on lists/journeys etc, which is they are automatically unsubscribed from those objects as soon as they are added to the DNM.
So is it possible to consider a feature where we can not only mass delete contacts from the DNM via CSV, but we also reverse the subscription status changees that were also caused by the accidental import.