The operative phrase there is
getting the land. That's a profit motive. Besides it's working pretty well for Israel currently. The question in West Bank is not why, but why not? Contrast that with Gaza (or Southern Lebanon, or Sinai), where Israel does not seem to have any desire to re-establish the settlements or drive the Gazans out anymore.
I specifically mentioned the two neighbouring Arab regimes that are openly hostile to Israel, but by and large keep to themselves, as worst-case scenario - and still managing to do a lot better than Hamas. That pretty much renders your point that Israel would find other excuses to oppressing Gaza because it perceives all Arabs as a threat, moot.
Neither of those two countries is wholly contained in Eretz Israel. And regarding ____ as a threat, does not mean one is required to oppress _____. Unlike Syria and Lebanon, Gaza is home to a large number of Palestinian people and ruled by Palestinian people, who are still viewed as a threat by the gov't of Israel. Your position ignores these obvious and salient facts which makes it unconvincing.
Eretz Israel is a zionist wet dream, like Dar al Islam is an islamist wet dream. Saying that the Jews are unable to accept a country within "Eretz Israel" and are therefore going to continue to oppress Palestinians until end of time, is just as delusional as the opposite claim that Arabs will never accept Israel and will fight until the Jews are pushed to the sea.
As for being a threat, you started with a claim that Israel views all Arabs as a threat, and now you've backpedaled to a position that it views only Palestinians as such. To me it seems that my argument was convincing enough make
you change your mind! But it's still special pleading to expect everyone to just assume that Israel would treat a hypothetical peaceful Gaza any differently than it does any of its other Arab neighbours.