It has already been mentioned and also the White Hats didn't stop anyone. The hacker got away with $30 million. Initially he used the exploit and moved roughly 28,000 and then almost a day later he had used the exploit to move funds from the 2 other accounts. Also most of these White Hats were probably from Parity trying to limit their fuckup.
That sounds pretty bad for Ethereum. It should make any serious investor wonder what other vulnerabilities are out there that could still be exploited.
The hack was caused by a clusterfuck. If they have already checked all possible vulnaribilities before forking ethereum, this wouldn't have had happen, at least that's what I think. You are right that it sounds very bad for ethereum, they need to fix it right now and I think Vitalik Buterin needs to act now to maintain the glory ETH has. I expect more dumps because of this soon.
I hadn´t heard that news until now that I read it here and I guess another vulnerability is added to the list of ETH, I suppose it can also affect to ETC also and all other clones,surely that news will not be well received by the ETH investors just that the price seemed to be recovering after a steep fall,but that is only a part of the risk involved and it is likely that more vulnerabilities will continue to occur within of ETH.