I think it is neat that the people who created the coin that was hacked is working with the exchange to identify the coins that were stolen and will be flagging them as such so no exchanges will accept them for trade or cash out. I think in a situation like this, the stolen coins should be flagged and burned and new ones created and redeposited. Of course legitimate transactions might be caught in the crossfire but I would think the recovery of $400 million is more in the best interests of the community vice a few people being caught in that.