Seriously, I bet any investigation went something like "Hay Ari, sorry I have to ask, it's just a technicality, you see... you're following all humanitarian laws, right?", and then their IDF lunch buddy went "Absolutely not, we do only the gentlest airstrikes and the Palestinians shake our hands in the rubble afterwards". Grilling the Israelis is something they're not ideologically accustomed to, let alone making them prove anything.