Don't just think of the hackers alone and just think what these exchanges themselves can do. You know they've got complete control over your crypto, be it any coin? You know they can run away with our coins themselves? Remember the Mt Gox exit scam? Many exchanges could report hacks due to either try to make insurance claims go positive on their end and they get what they want even with the stolen money (as they have that money already and/or they hire hackers to make it look like a theft). Don't forget that they don't even let you use coin mixers to withdraw your coins to those mixing services if they ever doubt on your requested withdrawal address and stop you right there to prove that it's not a mixing service you're withdrawing to. They can even suspend/ban your accounts for doing so, which is the completely brutal act in my views.