Ironically, that was one of the biggest campaign points and voter sentiment on which people flipped to Red. We all know what happened.
On the other hand, there is no guarantee that completely cutting off ties with Israel, would make anything better for Gazans. While it's possible there would be fewer civilian casualties, it's also possible there would be more if Israel switched to from precision strikes to ground invasions and dumb weapons.
And it's not a thin pretext--every hospital is a Hamas base. Remember all the rejection of the idea that Hamas HQ was in bunkers under the main hospital? Repeated denials that any such bunkers existed. Israel had a very simple response: we built the bunkers, we know they exist. If hospitals were acting as they should be they would be open territory--the IDF could simply walk in and look around. Yet every time it's been a big fight. And I remember a supposed "hospital" strike where they actually hit a tunnel--got the commander they were after and got secondaries. A bomb that simply explodes underground isn't going to cause secondaries, so clearly they hit a tunnel that supposedly did not exist.