I am not only alarmed, I'm disappointed as well! Cryptocurrency have an history of unscrupulous element always trying to exploit the weakness of any protocol or exchange. I believe security is not just one time thing, you have to be vigilante all the time and exchanges know this!
You don't have be disappointed, remember crypto currency is still in it's early stage and I believe that in the near future they plug all the loopholes and make crypto currencies more secured for everyone, it will take a little time but a time like that will come when everything will be secured.