Palestinians are mainly Arabs. Palestine Land was an Egyptian province. Israel took it from Egypt during the 7 days war.
After the war, Israel returned it back to Egypt.

Egypt saw something the whole world did not see. Egypt rejected the land back. Years later, Egypt built walls to fence out Gaza.

Now Palestinians have nowhere to go. The whole world is pretending as if its only Israel that is bordered with Gaza.

Egypt is also close to Gaza, Gaza is infact an Egyptian land. Egypt closed its border. They refused palestinians entry.

All neighboring countries shut their borders against them. Jordan, Lebanon, Egypt, Saudi all shut their borders.

They knew who these Palestinians are.

The lesson from this is that:

No one want problem