We killed twice as many German civilians, and three times as many Japanese civilians as are alleged to have died so far in Gaza strip, and that's taking the low end estimate in both cases.
Saying in 4 months Israel has already racked up 1/2 and a 1/3rd of civilian casualties we caused in a 4+ year long war is not exactly the point I think you want to be making.
Also I would have hoped that military strategy would have evolved in such a way to limit civilian casualties in the 80ish years since WW2 ended. Like you know not indiscriminately bombing cities and starving populations.