User blog comment:Godisme/Enemies in the Dark/@comment-919115-20111116193530/@comment-893506-20111116203810

Oh, I never said it would be justifiable. Those who have done it felt that they were justified, but it doesn't mean that it largely is. Like you said, we know what Kugo's like now, and at this point, it makes it hard for anything he's going to say feel like it is justified, especially since Yamamoto went through great lengths to give Ichigo his powers back.

As for Kugo's desire for power... yes, it is established that he was after it the moment he took Ichigo's Fullbring from him, and even now, he seems to like the power boost he gained from taking Ichigo's Fullbring, he seems to be enjoying how much power he's gained from it (as all the other members of Xcution did), but until he mentioned this "enemy", we had no clues as to why he desired Ichigo's power. It seems to be to defeat this "enemy" but whether or not the "enemy" is of real concern to Ichigo and his friends is yet to be seen. Whether or not he left the Soul Society is yet to be seen as justified or not, because we do not even know what Kugo knows yet. Heck, we don't even know how many people know what Aizen knows about the Soul King (Urahara is one of the few who seems to), so there are some things to be explored before we can understand the full motivation of Kugo.