Well, we can agree now that the European settlement of the Americas wasn't OK - but back then there was a lot less information about what was going on, and due to the vastness of the land and the sparse population of mostly hunter gatherers rather than farmers, what was happening wasn't even necessarily clear to those actively engaged in it, as they saw themselves as settling unused land (which was used, but in a different way).
If something similar was happening to Native Americans today as is happening to the Palestinians, you can bet there would also be a massive outcry.
FWIW, I do think Israel has the right to exist now. Like the Americas and Australia, what's done is done and it isn't realistic to reverse it.
But it is possible to stop what is happening now, and to try to come to some sort of workable solution for both sides. And the fact is that the current Israeli government is not remotely interested in this, and only they have the power to change things. The Palestinians in the West Bank already compromised as far as is realistically possible, yet expansion of settlements continues regardless.
I appreciate your posts here and your perspective is valuable. I think the posters here dismissing the emotional pull of Zionism for Jews who may like yourself be aghast at what is happening are playing into the hands of the Israeli right wing who it seems to me thrive off the idea that everyone is out to get us and we have to put ourselves first.
But on the other hand, unconditional support by western powers for Israel is part of how we got here as well. I'm not sure what the right balance is though, or if a solution even is possible at all. The situation seems hopeless and depressing.