Step 8 is putting your moral inventory to work by creating inventory of those that you may have harmed. We must manage our guilt, and as in step 4, assess the guilt for hurting others. The weight of the guilt lightens once we take action to admit our wrong doings. This helps us become accountable for the danger of our unmanaged addiction.
Once we can face this truth it gives us the empowerment for progress. Step 8 along with other steps become a recurring theme of making amends of the social harm we may have caused. The reason that this concept is so important to the 12 steps is that it replaces addictive behaviors that tend to be only self-serving with ones that are for the greater good (including for you). Once this step is executed you can look forward to less guilt, more motivation, better relationships, and becoming a step closer to recovery.