The irony is that the Catastrophe, including the Israeli annexation of certain lands allocated to the Arab State of Palestine under the 1947 UN Partition Plan, came about in great part because the combined armies of Egypt, Syria, Lebanon, and the Trans-Jordan invaded Israel on its first day of existence.

This is simply not true. It's one of the many myths about Israel that have been foating around for a long time to the great harm of the Palestinian people. Since you don't seem to be reading my links, I'll provide the relevent text here:

Statehood and Expulsion

What was the Arab reaction to the announcement of the creation of the state of Israel?

"The armies of the Arab states entered the war immediately after the State of Israel was founded in May. Fighting continued, almost all of it within the territory assigned to the Palestinian state...About 700,000 Palestinians fled or were expelled in the 1948 conflict." Noam Chomsky, "The Fateful Triangle."

Was the part of Palestine assigned to a Jewish state in mortal danger from the Arab armies?

"The Arab League hastily called for its member countries to send regular army troops into Palestine. They were ordered to secure only the sections of Palestine given to the Arabs under the partition plan. But these regular armies were ill equipped and lacked any central command to coordinate their efforts...[Jordan's King Abdullah] promised [the Israelis and the British] that his troops, the Arab Legion, the only real fighting force among the Arab armies, would avoid fighting with Jewish settlements...Yet Western historians record this as the moment when the young state of Israel fought off "the overwhelming hordes' of five Arab countries. In reality, the Israeli offensive against the Palestinians intensified." "Our Roots Are Still Alive," by the Peoples Press Palestine Book Project.