Why are people reacting surprised about the events in Israel?

The modern Isreal-Palestine conflict began just after WWII when Britan, who took the land during the war, decided it wasn't worth colonizing and somehow accidentally sold the same parcel of land to both Isreal and Palestine. Oops! They then asked the newly created UN to fix the problem and they drew a jigsaw puzzle map that both Isreal and Palestine hated. Isreal then immediately occupied most of the disputed land by force and the UN did nothing about it.

I don't think people are surprised about attacks killing large amounts of civilians in this area. I think people are more surprised world leaders have mostly decided to act like nothing is wrong with the situation and there's no need to fix or change anything. In any other area where things like this occur, the countries involved are usually heavily sanctioned or chastised by other world leaders.