I'm a Gentile, with no close Jewish connections. That said, I read Leon Uris' "Exodus" when I was quite young, and his "Mila 18", which is a fictional account of the Warsaw Ghetto and the Jewish uprising there in my late teens. Those books and my knowledge of WWII made me hate the Nazis and sympathetic to Zionism. I've backed Israel pretty reflexively since.
My opinion began to change when the U.N. ordered an end to new Jewish settlements on the West Bank and Netanyahu openly encouraged people to hurry and open more settlements before the ban took effect. They were basically stealing land that had long been held by the Palestinians who were pushed out. Over the years since, these settlements have continued to spread and Israel has become more and more openly racist in those dealings. Acts of violence against protesters and journalists have been disturbingly common. I understand the history going back to 1948, and that Israel is surrounded by enemies who would love to see them all dead and gone.
Still, many of the Israeli government's choices have set my teeth on edge.
The IDF is going to go into the Gaza Strip and hurt people and break things. That's war. The problem is that this is exactly the response that Hamas wants to provoke, a heavy handed reaction that fuels another generation of hatred and terrorism, the warfare of the less powerful.
I also save a share of the blame for the various Arab states who have for decades funded and fueled this conflict with money, arms, and ideology. They have done virtually nothing to help the Palestinians, partly because of tribal and ethnic differences and partly because having the West Bank and Gaza Strip remain weeping sores on Israel's borders pleased them.