Israel has stolen that land for its own exclusive use. And I believe it is about 44%.
Show us, in a map, what your are referring to.
Sure, note that Shajailya was totally destroyed. Whatever excuses Israel gave does not hide the fact that it was inside the planned buffer expansion and had to go.
This was in 2014. Lots of families were forced to move.
Egypt Flattens Neighborhoods to Create a Buffer With Gaza
This one is more recent:
Sources in Gaza told Haaretz that the works will force a lot of families out of their homes. Hamas will have to either pay these families compensation or find them alternative housing. The main question that remains to be answered is the effect these works will have on the tunnels under the border, which remain a major artery connecting the coastal enclave to Egypt.
read more:
Hamas preparing buffer zone along Gaza-Egypt border
So, in so many words from that map, you are complaining about Israel protecting its population with the buffer zone. But not Egypt.
"The barrier has been effective in preventing
terrorists and
suicide bombers from entering Israel from Gaza. Since 1996, virtually all suicide bombers trying to leave Gaza have detonated their charges at the barrier's crossing points and were stopped while trying to cross the barrier elsewhere.
[10][11]From 1994 until 2004 a suicide bomber originating from within the Gaza Strip successfully carried out an attack in Israel (the March 14, 2004 attack in
Ashdod).
[12]
IsraelāGaza barrier - Wikipedia
And look at what Abbas has said about the Gaza-Egypt barrier (wikipedia, same page)
Support for a similar EgyptāGaza barrier
Palestinian Authority President Mahmoud Abbas declared support for the
EgyptāGaza barrier, adding: "It is the Egyptiansā sovereign right in their own country. Legitimate supplies should be brought through the legal crossings",
[20] although he made no such comment towards Israel's sovereign rights. The United States announced its support for the Egypt-Gaza barrier saying it would prevent weapons smuggling.
[21] Cairo's main Al-Azhar University officially backed the government's decision for an Egypt-Gaza barrier saying that it was the "state's right to build along its walls facilities and obstacles that will enhance its security."
[22]
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SEE ???? All in all, barriers around Gaza are a good thing. Prevent attacks, smuggling and all the other nasty ideas Hamas and other groups there keep getting all the time.