You must be careful not to delete a trustee object that has the only trustee assignment to a part of the Directory tree. If you do, you could cut off access to that part of the Directory tree.
Be careful not to block all users' rights to an object with an Inherited Rights Filter, which would leave no one with access to part of the Directory tree.
Therefore, be aware of the following before you delete a User object:
To view these attributes, select the User object, and right-click once. Then select the attribute you want to view from the available options.
If the User object you want to delete has the Supervisor right to another object, transfer that Supervisor right to another User object before you delete the original User object.
Or, give a User object in a higher container the Supervisor right to objects, and then block other users from deleting those objects.