they are hacked by themself

what proof do you have? are you a staff member of that exchange?
If you're stupid enough to keep your coins on an illegal exchange, then you deserve to have your coin's stolen. This was probably a good thing.
No this is not. people who lost money is a another thing. but you should not forget that this is effecting bitcoin price so badly. so anyone who stored their coins in the exchange lost money and anyone who have bitcoin are also being in lost some how because of the price drops.
I found some Interesting facts want to share here:
a newbie user giving away 1000 bitcoins for free here:
https://bt.irlbtc.com/view/1574127.0just read the OP's name and make it upside down.. You'll see the name will show like this: Bfxhacker = Bitfinex Hacker does this mean the hacker stolen all money and giving them away or he may belong to the hacker team somehow..
the balance of that user's wallet are from 2013, this thing make me confused.