Considering the goal of humanitarians is to promote flourishing and well being of the human race, it would be a poor argument to say that humanitarian intervention in nearly any instance "isn't justified". At the very least, humanitarian angles need to be considered very carefully as there typically aren't ulterior motives involved.
Who exactly typed this question? It makes no sense. I assume they meant Libya. If they did, then yes it was justified. The people of Libya were rising up against their longtime dictator, and clearly foreign support for their cause was popular within the nation. It was indeed justified to do so.