We all know how Mt Gox manipulated bitcoin price by creating "Willy Bot". I'm wondering what stops others from doing the same? I mean anyone with enough resources can easily develop such bots and manipulate the market as per their need.

Right now bitcoin price is dropping and everyone thinks it's due to the fear of what might unfold on August 1. Is it not possible that some whales might be using this situation as a cover up to manipulate the market yet again?