Arab massacres of Jewish settlements began as soon as the mandate in 1920, continued in 1929, 1936-39 and after 1945. During the first three the Irgun, Stern and Lehi didn't exist. In your world effect and cause are reversed.

In 1937 the Jews accepted and the Arabs rejected the Peel Commission's partition plan, the first of their rejections of a two state solution that was followed by identical rejections in 1947, 1967, 1979, 2000 and 2008. Ernest Bevin explain why: "the #1 priority of the Jews is to build a state. The #1 priority of the Arabs is that the Jews not have a state."

That's the entire conflict: Muslim supremacist dhimmitude restoration and Jewish sovereignty denial.