BuddyPress.org

Hello!
I was organizing roles for my admins, i want them to be able to delete activity and public group posts. However currently it includes that they can view/delete activities from private groups even if theyre not apart of such groups. How can i make it so that their admin role is only restricted to public activities/groups? This is really important for my site, i appreciate your help. im using the user role editor by vladimir. Perhaps theres another plugin i can use or css code?
thank you