Update: Apparently you can only damage the tower if targetted, not as part of normal DPS rotation on the boss or adds. Still, in my mind as a raid team, they analyzed the encounter and found a method that would ensure success. Great analytical thinking, and then superb execution. I do not think the punishment fit the "crime".
Now that is extremely heavy-handed of you. Your premier global raiding guild defeated your final raid boss... Due to an glitch, bad coding, unforeseen use of special items made by an Engineer..
That is just not acceptable. Yep, apply the hot-fix to prevent it from happening in the future, but removing the achievement, items AND banning them... That is too much.
I think you over reacted and used a 10ton hammer, instead of a more dignified approach.
Yes, its terrible that your premier, showcased final boss are defeated more hours after it became available to the the players. Yes, it was a mistake on your part for allowing saronite bombs to assist with the ease of the default. But were has your Q&A and design teams been? Have they not kept up with the players' theorycrafting to maximize DPS for each class and talent build?
However, banning the entire raid for the use on a item, that is a common craftable item from one of your crafting professions - is egg in your face. Not Ensidia.
I applaud the players and raiders in their guild. I wish them the best on the next time they face the Lich King and that the "fixed" encounter pose no additional problems for them.
Blizzard - go take a chill pill and rethink how you will handle situations like this in the future, when players, using the tools you provided them, destroy your carefully crafted plans in a short time period.