What you aren't taking into account is that none of the major exchanges tha got hacked had major KYC (know your customer) standards. As such it is very unlikely that any of them had a sizeable amount of legitimate personal data, so even if you are right, its little to be scared about. Now if this sort of thing happened to Coinbase or Bittrex or another major exchange that keeps up with KYC standards, then we will have something to worry about.