I'd like to add to Terry's response that I'd have an access level in my instance called "Delete Comments" and, when needed, you can login as that user on another browser and temporarily flip the switch on that access level for the user, delete the comment as the user, then flip the access level back.
This ensures that you don't give elevated rights to anyone. Instead, you give completely reduced rights to one person for about 5 seconds. Does this make sense? Narayan Raum Workfront Delivery Lead - SunTrust Bank
https://wf-pro.com for Text Mode & Solutions