There are people who hate Israel for deep religious and ideological reasons - mostly Muslims and people on the extreme left who tend to see Israel as the root of all evil. For these people you're totally right - no matter what Israel will do its always going to remain the root of all evil. But for the pragmatic part (dare I say majority?), if Israel finds a way to navigate an end to the war and start the reconstruction of Gaza, I don't see why it can't "come back" from its current position.
So again, I'm not making light of Israel's standing - it's bad. But no, I do not think its irreversible.
The challenge for Israel is that there appears to be few limits on what they are prepared to do. Putting aside more recent examples, the decades long encouragement of settlements and displacement of the Arab population and accompanying violence is something I'm not sure how Israel reverses.
I'm not sure most, or even many, people see Israel as the root of all evil. Where does that perception come from? Unfortunately the actions Israel is involved in now most would classify as evil and deliberately so. Rightly, or wrongly they are perceived to have the backing of the majority of the population, which is what makes me think that Israel is not going to fully recover from this period, unless of course they can change course in a similar way to South Africa.
I think there is a huge proportion of Muslims world wide who believe this is the case and also a pretty sizable amount of left wing (especially 'Woke') people in the West. Unfortunately some of these people don't even make a full distinction between Israelis and Jews, so it became bad news to Jews everywhere. I can go on and give a bunch of news stories and anecdotes (your own comment - the words you choose to use btw kind of reinforces my theory) but I don't think anything I write here will change your mind.
I don't see how Israel come back from it's current position, even with U.S. backing. Deliberately killing and maiming children and the vulnerable in the many thousands is not something that a lot of people can overlook, regardless of what type of context is provided.