Comment by johnrichardson

You fundamentally misunderstand PoS. There is no social trust involved. It will work entirely through economic incentivization, including 'group penalization' when enough validators are offline/byzantine at the same time in the case of Casper. Read more here and try to fully understand this document before you make blanket statements like 'PoS won't work': https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQ