there's certainly plenty of space to criticize israel's recent actions in gaza. i would agree they're distasteful actions, but the general crux of what israel is doing right now is required. others may disagree may forcefully, and there is plenty of room for subtlety.
however, the jurisdictional question is pretty clearly in israel's favour (you can't get out of the circular logic applied by the court and some western states) and the idea that israel has been intentionally starving the population has - at least until perhaps very recently - been entirely without merit. israel should defeat these specific charges, the way they are written, and that is what they should do, rather than something else.