There are many many of us Jews that don't feel that our own safety depends on the control or suppression of others. While many of the refugees who came to Palestine as pioneers after the Holocaust had intentions to live peacefully in harmony with the Palestinians*, almost every action of the Israeli government since it was founded has been to treat Palestinians just as badly as we had been treated in Europe.
The ultimate consequence of this has been to harm and dispossess several generations of Palestinians which is extremely effective at ensuring they continue to resent Israel's existence and feel that they must do anything they can by any means necessary to ensure the survival of their people. If Israel can't exist peacefully with Palestinians, what gives Jews the greater "right" to the land than they have? How can we go from being refugees with no safe place to go, to violently forcing the exact same situation upon another people just for the gall of wanting to continue to exist with their families on their own ancestral land?
Even if I was a Zionist I would think that the last 6 months were creating long term curse on the country of Israel by creating a whole new generation of Palestinians with nothing but rage for Israel and nothing to lose. You can look at even the most sanitized accounts of the assault on Gaza see absolute cruelty on the part of the IDF as well as no concern for human life or international law.
(*) For anyone interested in the politics of Israel's founding, I highly recommend I. F. Stone's book Underground to Palestine about the heroic (as he tells it) journey of Jewish refugees trying to reach Palestine in 1946. In 1978 it was republished with 2 new essays from him. One about how Zionism was hijacked by Jews with no regard for Palestinians' rights or well-being, and the other about how it has become completely impossible to have rational conversations that are critical of Israel. https://en.wikipedia.org/wiki/Underground_to_Palestine
