I don't think Hamas even tries to claim that it accidentally kills Israeli civilians during military operations. Killing civilians is the stated objective.

There are a LOT of videos from Gaza when Israel notified civilians to leave a building before it destroys it. That seems contrary to the goal of killing civilians.

The other obvious thing is - since Israel is already totally smeared as a genocider (eg this story) it could be argued that it can do whatever it wants and suffer no further PR damage. So to the extent that it still shows restraint - it's either because they don't want to kill civilians or because they are still playing to an audience with a discerning moral compass internationally.