I think it is rather naive to think this could not happen again in an active combat zone. Even if you came up with a way to try and identify aid workers, what makes you think Hamas would not outfit terrorists in fake versions of those identification methods and use that camouflage to attack Israelis?
It’s a tough one but they need to be more careful in prosecuting this war.
They must get this by now and the IDF have more experience in this kind of warfare than most forces