Because they have been told that Israel occupies Arab land.
Historically false information since Arabs come from further east and south and did not remain in the area long after 700AD. During the 19th century the area of present day Israel had little in the way of cultivated areas but was desolate ground. The Turks, who ruled the area, sold land to Jewish groups in the hope that they would make it productive. Meanwhile, small communities of Jews who had never left the area continued to grow but the local Imams would inspire the local Muslims to rise up and slaughter the Jews.
He’s got someone who is made up in his head ... LOL ...
See Post #15 ...