I mean they clearly do. A cheap and WW2 era artillery bombardment of the region could have killed an easy 200k in a week.
The UN believes a modern conflict will kill about 9 civilians for every militant. Hamas’ government last I checked reported about 11k casualties, 100% civilians. If that’s the IDF would need to have killed 1,200 Hamas fighters to meet that ratio. Given that there’s an estimated 20-40k fighters in Gaza we should expect 180k-360k casualties if the IDF nominally completes their goal of eliminating Hamas military.