Yeah cause clearly that's what was happening for the past 20 years prior to Hamas inflicting the largest casualty attack of Jews since the Holocaust, amirite?
And in waging urban combat, you designate combat zones, drop leaflets and roof knock bombs because you wanna maximize casualties, amirite?
First, i'll start by saying hamas was obviously not justified in what they did. then begin on your points:
1) re: urban combat and designations + leaflets: basically all of gaza has been designated a combat zone almost constantly - much like the hokey pokey, bits are put in and out on a whim. Much of the population have been displaced multiple times.
compare this to the speedy campaign waged against hezbollah or iran, where there was precision intelligence to bomb things out with minimal (not zero) civilian casualties. israel is capable of being precise.
2) roof knock bombs: omg - there are no roofs left to knock on (look at photos of gaza, seriously.), and even if there were, i think this "generosity" went out the window a few wars ago. tents don't have roofs to knock on. - don't pretend israel has been kind by "knocking" on the roof of people waiting in line to get water.
3) largest casualty of jews since the holocaust: I agree this is terrible, but is an arbitrary measurement. nobody seems to bat an eye that israel has 50x'd that terrible number, nor that they're inflicting very similar suffering to what the jews suffered in the holocaust (hunger and relocation at the very least being undeniable within gaza, intention to relocate the populace being disgustingly touted by certain groups).
And in waging urban combat, you designate combat zones, drop leaflets and roof knock bombs because you wanna maximize casualties, amirite?