Vitalik was not part of the DAO, and the Ethereum Foundation took an extremely hands-off approach to the DAO hack. This is pretty well documented in the Crypto

Vitalik was not part of the DAO, and the Ethereum Foundation took an extremely hands-off approach to the DAO hack. This is pretty well documented in the Cryptopians book; the DAO hard fork was driven almost exclusively by people outside the EF.