I know this is a bit but honestly I genuinely like this idea. Yes at the moment Israel is using proportional deaths as a cudgel, but generally in is very useful to look and rhetorically powerful to look at this metric and gives the savagery of US invasions of Korea, Vietnam etc a unique potency.
It's not the only useful lens for comparing tragedy, but to say that The Korean War inflicted 20 kBu is an extremely damning statistic.