In my opinion, this incident should be foreseen when CCM added new members to T-ara (either Hwayoung, Areum nor Danne)
Idols are also human being, they have weaknesses like all of us. For us as ordinary person, we do argue with our best friend and boycott someone among the group of friend. T-ara stay together most of the time, problem and disagreement might arise from time to time. Just to say that, disagreement or argument not as bad as you think, it might be a way to speak your heart out to others.
CCM, if you want to get the bad incident solved, you shouldn't blame anyone or the twitter account (you think account being hacked is a good reason?). Let the girls solve the problem by themselves, I think they are mature enough in solving their own problem.