Ah yes, Jordan, Egypt, and Syria have no blame for this situation. It’s not like there was a major international body that attempted to create borders and one side agreed to and the other side attempted to exterminate the other in a belief they could win a war, then attempted again a few decades
A party that should be holding the major bag is the Muslim Brotherhood in Egypt. Hamas is a major wing of their organization and yet, they keep the border closed. They could set up a major airport in Rafah and open trade routes into Gaza. Israel would have no say, but they don’t.