Human history and scams

[Obulis]

WHAT'S THE HIGHEST SCAM IN HUMAN HISTORY!
The history of humanity is never without one scam or the other as it is some how becoming a pandemic already. Ranging from Health to other walks of life, even in religion. Just like the scam of killing of twins in some cultures... Like the hyping concerning academic schooling
What other scams among humanity has come to be as though nothing but fantastically fallacious..