We should never forget.......This is generally meant for the most beastly acts of the last century but also for much smaller scale beastly acts of this century..........may they disappear from our world.
My addition:
The Tribal Condolence: The Masai tribe of Kenya gave 14 of their best cattle to the United States, following the attacks. [see in the pictures # 18]
I found this one of the most beautiful reactions [if you know who the Massai are] They were studied for their extreme good health and have baffled all medical researchers and "ruined " all the theories about cholesterol and fat etc