I don't who is wrong or right here (Coinbase saying there was no breach or alledged hackers via pastebin), but isn't having fake security breaches for large bit

I don't who is wrong or right here (Coinbase saying there was no breach or alledged hackers via pastebin), but isn't having fake security breaches for large bitcoin sites a good opportunity to manipulate the rates? If one wanted to bring the rate down it might be possible to do this with creating a good fake security breach of a large site.