All of these hacking incidents are not good not only for bitcoin but for any has trust them to put his money I'm waiting to learn the security leak in the measures of this exchange if they will publicize it. I don't know how many exchanges are operating worldwide but it seems to me that the rate of hacking them is increased. I wonder if the abilities of hackers have excelled or if the security measures of many exchanges are obsolete.
I can only imagine that the price rise of bitcoin also encouraged hackers to start hacking exchanges. When 1 BTC was only worth $100 there was less incentive to steal them than when the price is $1300 like it is now.
Next to this, i guess chances that you're right about the security measures are great... Since there are so many unregulated exchanges popping up, there is a big chance that some of them weren't coded with the latest security standards in mind.