If you think the ICU was the solution, thats great. But Somalia doesnt exist in a vacuum. Obviously Ethiopia, USA, somaliland, puntland, Djibouti, the first three having fought groups just like it felt threatened by its ambition and extremism, they believed they had to contain the ICU to protect their own country; they fucked up in the process. The question is the ICU left unchecked would have caused more problems in the long run (hardliners vs peace), conflict in the north, A bigger invasion of Ethiopia without usa's involvement.
Lastly how was the UN to be blamed by usa/ethiopia getting themselves involved in Somalia.