I'm not saying Israel should keep occupied land. At all. You're saying we should abolish the state entirely. Sorry, that's borderline genocidal. And not what happened to Nazi Germany either - it was occupied and then basically newly founded. What you imagine for Israel would be closer to a solution where the occupying forces in Germany after 1945, or maybe the surrounding countries, took their share of German territory for good. We wouldn't have a Germany today if that would have been the decision made back then.
And we wouldn't have Iran, Russia, North Korea, and a whole bunch of other nations with humanitarian violations either, even though you conveniently skipped that point.