BuddyPress.org

i think “damage” is the wrong way to put it. the extraneous roles attached to your existing sites are meaningless and should be ignored in any case. you may be able to reset the old roles by running the built in bbpress repair scripts or alternatively you can install this plugin i use:

https://wordpress.org/extend/plugins/user-role-editor/

which also has the ability to sort of reset all users to their default roles and capabilities.