Great initiative. Couple things:
1) The first point I think we can do without the slam on Mt. Gox. Though well deserved.
2) I don't think we should bate hackers with a challenge like ,"Cannot be hacked"
I think it suffices to say something like, "It is a decentralized derivatives exchange that solves many of the security issues inherent in centralized exchanges. Mainly that bad actors at a centralized exchange may steal funds and centralized exchanges are a big target for hackers. With BitShares your funds are always stored securely on the blockchain."