The ICC lacks juridsiction over the war crime of collective punishment, so that would be an easy win for Netanyahu. To charge him with collective punishment either the united nations security council would have to create an ad-hoc tribunal, a domestic israeli court could charge him, or some other national court under the principle of universal juridsiction could bring charges. The ICC cannot.
More generally though I agree. I'm a big supporter of the ICC and generally believe it to be a fair court. I'd like to see those accused stand trial, present their defense, and let justice be done no matter which way it leads.