maybe because they are trying to act ethically toward a murderous neighbor that is conducting asymmetric warfare and those are the best tools to accomplish that.

or, maybe because they came to the conclusion that the repercussions on the world stage of even more horrific media coming out of Gaza is too steep of a price to pay.

i don't know which, but i do know it is naive to conclude that because they COULD end the war in a day and did not, they are driven by morality and ethical concerns rather than pragmatic ones.