This seems pretty simple to me.
Decentralized crypto-currencies are all about consensus.
Vitalik suggested a hard fork rollback.
The majority seem to want it...that's consensus!
Now roll it back.
Note - I was not affected by this DAO/ETH situation.
You go into the casino and win legally 50 Million with a new technique.
Not the true story, true story:
A crew of people invest 150 Million into a new casino with all new technique, someone finds a flaw in the code and cheats out 50 Million of the casino...
What to do ? Of course roll back, fix the code, and "restart" the new technique casino...
You didn't understand the image... the new technique was not the blockchain... but the different call of the contract by the attacker...