Bitstamp is not a bank. If their customers didn't use it like a bank they wouldn't have had all those coins in their hot wallet and it would have been a much smaller loss.
it doesnt matter one bit ,if they cant secure a hot wallet properly they should not be in the business of holding hundreds of millions of dollars of btc for their community,the excuse/result would be the exact same if the cold wallet got "hacked" too and everything was gone .........
this "hacked" bullshit get thrown around way too much and too easily with no more or less no reprecussions to whoever was in charge and either did it or let it happen ........
Compare this to gox who was almost hacked on a regular basis