Those people that hack are a blight on all FPS online games. They are scums that destroy games online. For one hacker there are countless players that quit games because of them. I remember so many games that lost players because of hacking. CoD, DoD,CS, Medal of honor, BF just to name a few.
Blizzard permanently banning them is great and everyone has been warned. The fact that they banned again if they repurchase is great. It says we dont want YOU the player to ever play our game.
Great move blizzard, much appreciated.