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The number of journalists killed by Israel in Gaza in two years exceeds the number of journalists killed in both World Wars I and II, the Vietnam War, Afghanistan, and Yugoslavia combined. It is the largest toll in the history of modern warfare.
Eh, on the flipside a pretty good way to find a CIA agent in your nation nowadays is to start heavily looking at the US based journalists in your nation. Remember that journalist that the Saudis chopped up? He was very likely on the CIA's payroll.
Also if you really want to get down into it historically speaking, warcrimes are generally only enforced and prosecuted by the winners of a war, if they have the geopolitical power and desire to do so that is. So realistically the rules of warfare end up a lot closer to a honor system than what people want to admit.