A good article. War is much more destructive than many people appear to think, and war against a well-fortified enemy in an urban area is especially so. No malicious intent beyond the intent to defeat the enemy is necessary.
The Genocide Convention and Geneva Conventions were adopted specifically because of the horrors of WWII. Things like Dresden, the firebombing of Tokyo, and (obviously) Horoshima/Nagasaki would obviously be war crimes today even if the charge wouldn’t be genocide.
In a just world, the leadership of both Israel and Hamas would be prosecuted for crimes against humanity. We may not live in that world today but I hope they at least spend the rest of their lives unable to travel to countries that arrest war criminals.
(obviously) Horoshima/Nagasaki would obviously be war crimes today
The same man was the President of the USA when nuclear bombs were dropped on Japan and when the Geneva Convention of 1949 was written. There was certainly discussion at the time about whether the Allied bombing campaigns had been in accordance with the laws of war, but the stance of the US government was that they were, and this stance was apparently not incompatible with the Geneva Convention of 1949.