Yes, just hide inside the protocol during times like this. Not everyone is such an expert however. Most of the world uses blockchain.info wallet... If I accidentally double spended $400 then a scammer can double spend just as much as he has in his wallet. These are double spends that occur on the actual blockchain, something in .info's protocol is allowing people to broadcast spent inputs as long as they are unconfirmed. Then send another one with a much higher fee, and the ridiculously good few gives it priority when the miners decide which one goes in the block.

Very real double spend, no 51% attack required. .info needs to overhaul their code ASAP