My opinion is that today dip was caused by the hack. I think people hearing hack, exchange and 400 million in the same phrase start to panic sell. The market is extremely sensitive to all news, especially to the bad ones. Every time something bad happens or even a rumor appears that something bad might be planned there is a dip.
Yeah we sure have seen some examples of bad rumors spreading and causing big dips, like the rumor(s) of China/ South Korea banning cryptocurrencies. Also 10 days ago when Bitconnect crashed, bitcoin lost about $4k ($14.000 to $9.600) and it's still around that price.