What it is possibly with even more violence. Most of the hand wringing on the Left about Israel beating the snot out of Hamas comes in one of two forms:
Some insane, idiotic, belief that it isn't "fair." Unlike say a boxing or wrestling match where the opponents are matched by weight, height, etc., war isn't like that. In a war you should strive to be so goddamned vicious and overpowering that you can take out your opponent with minimal losses. Think, in this case, a 90 lbs. weakling sucker punching an MMA champion fighter. The result after that single punch is the MMA guy pounds the weakling into a puddle on the floor. The Left thinks that's unfair. The Left are idiots.
The other scenario is the Left wants Israel destroyed and gone. Here too, they can see they're not going to get what they want and with Hamas gone it'll only be harder for them to achieve what they want. So, they are calling for a ceasefire, ending the violence, etc., so Hamas can recover and go yet another round down the road.