It's possible to provide food, water, services while keeping a close eye on the Gaza population and ensuring the idea of peaceful cohabitation is dominant. The economy will slowly - or even not so slowly - rebuild, and that's a part of the demonstration of possible and beneficial, from some positions, approach.
Etc.
The comparison with Germany doesn't stand. Two completely different situations, different histories, different people, different mindsets, different economies. You can't just let them rebuild it and hope that people in Gaza don't plan your destruction again and again.
It could be argued that Israelis need "deprogramming" - look at the scenes we've seen over the past few days, with hordes of Israeli civilians blocking aid from entering Gaza. Look at the torrent of vileness spewed forth online by many Israelis. Look at the Israeli Telegram groups where they share and laugh at images of dead Palestinian children (actually, don't look; it's just too much).
Religious extremism is not just a "Muslim thing".
That's the difference.
The only people we see killing day after day after day, without hesitation, are the IDF.
It's quite clear that Israel has been doing everything they can to render Gaza uninhabitable - senior officials have even publicly said that's their aim. Furthermore, it's clear the aim is a revenge-fueled massacre of civilians, followed by ethnic cleansing - senior officials regularly call for Gazans to be shipped out to other countries.