The perfect memorial may not exist, but the closest one, in my opinion, is the Armenian Genocide Memorial in Yerevan. If the purpose of the memorial is met, then it has done its job as a memorial. The Armenian Genocide Memorial comes to mind as it serves as a reminder of those who have fallen despite other people and governments denying that they were at fault. The flame in the middle of the is kept lit constantly as a representation of the Armenian peoples' memory. By keeping this constant reminder, it has done it's job of reminding people of what really happened.
As for forgiving and moving on? The politics of the Armenian genocide becomes tricky in that the Turkey denies using the word "genocide" to accurately define the event whereas many other scholars and historians use the term firmly.
To say that memorials "entomb" the becomes contradictory to their original purpose is a bit of a stretch as the majority of the people who go to memorials go in reverence of the historical event. Although there is truth in saying that people tend to pat themselves on the back just for going, I do not believe this is true for the majority.
