Access level and privileges are also different things. For example, a troop leader might a parent to be able to see all of their children’s accounts, events, awards, and so forth, but doesn’t want them to be able to change anything. Access level (self, household, patrol, unit, den, troop, whatever it is) only determines what you can see. Privileges determine what you can or cannot do with those users you can see. So a parent with household access and the privilege to edit achievements can edit his or her child’s achievements, but not those of the rest of the troop. Someone with troop level access can see everyone and everything, but cannot make changes unless the appropriate privileges have been added to that user.
I hope that makes a little more sense of the issue.