Either man up and accept responsibility, or learn to deal with this sort of thing A LOT. it's your choice really, I am not here to argue this. I know from experience how this stuff is done, and how often the people I would talk to would run scans with the game open, and find a boat load of malware, after I explained to them that there s****y Norton and Mcafee has no idea how to detect malware.
duh?! you never answered the question on why only D3 was compromised among ALL THE OTHER GAMES i've been playing and some of them i've been playing for more than 3 years and i never had this crap. I think your the one that should man up and the Blizzard team should be the ones starting to take responsibilities for their epic failures.
Read my other posts, listed to what the blues have said, and all will be answered.
What's really frustrating about you in particular right now, is that you are demanding answers to problems that have answers just a quick search away. This is the kind of lack of action that caused your account to be hacked.
This is what I mean when I am saying man up, you are whining and crying about something that has been happening since like 2005. The information is out there, and it's EASILY found. Heck even on Blizzards very own support site.http://us.battle.net/en/security/checklist
Don't put so much worry into how this happnened right now. just find out how to fix account compromises. After you have taken the first steps, which is securing your account, you don't have to sit there scared about getting hacked again while you are doing your searches for who to blame if you already know that nobody is going to be able to get in your account easily (and more importantly, that your account is harder to get into than the guy who doesn't take and security measures, and doesn't have an authenticator.)
I have been hacked once before, I am telling you just do what they tell you to do and you won't have to worry about this stuff anymore.