Israel withdrew from Gaza due to public pressure from the parents of drafted soldiers in the occupation force. This was not done out of compassion, it was done because the government at the time could not have held its coalition together without getting the troops out of Gaza, just as earlier they had to get out of Lebanon.
Gaza was never, ever part of Israel. The Israelis took it by conquest after a war and decided to keep it. After all, it is Mediterranean seafront property.
Judaism is one thing, Zionism is another. It is not "anti Semitic" to oppose Zionism. Many Jews are anti Zionists. And Arabs (including Palestinians) are Semites as well.
AIPAC (American Israeli Political Action Committee) does everything it can to paste the label of Anti Semitic on anyone who opposes the Netanyahu government, which at the moment is a coalition of something like 52% of the voters.
The guy who fixes my car is an Italian Jew who was raised in Israel. I don't discuss politics with him, because there would be no reason to do so. He once owned a Mercedes wagon like mine and says he drove it for 900,000 miles. Mine has only 230,000.
With or without occupation troops, Gaza is an open air prison.No one can leave by land, sea or air without Israeli or Egyptian permission. Prisoners resent being imprisoned, and those who were born in prison and have never committed any crime tend to resent it even more. The status of Gaza has not changed since 1947. Gazans were mistreated by the Egyptians and treated even worse by the Israelis.
Gazans did not start any of the wars with Israel. Israel has fought at one time or another Egyptians, Lebanese, Syrians, Jordanians and Iraqis, but not Gazans, who have never been armed as Gazans, though perhaps some might have fought for Egypt.