"Jews must stand by Jews — including the marginalized JDL"
No we don't. Would Stilwell have opposed David Ben Gurion and stood by the Stern Gang and the Irgun? Make a choice, one or the other.
Here is the choice Ben Gurion and Menachem Begin made.
"At the end of the war, when it became clear that the British government had no intention of altering its anti-Zionist policy, the Haganah began an open, organized struggle against British Mandatory rule in the framework of a unified Jewish Resistance Movement, consisting of Haganah, Irgun Zevai Le'umi - Etzel, and Lohamei Herut Yisrael - Lehi.
Haganah branches were established at Jewish D.P. [displaced person] camps in Europe and Haganah members accompanied the "illegal" immigrant boats. In the spring of 1947, David Ben Gurion took it upon himself to direct the general policy of the Haganah, especially in preparation for impending Arab attack. On May 26 1948, the Provisional Government of Israel decided to transform the Haganah into the regular army of the State, to be called "Zeva Haganah Le-Yisrael" - The Israel Defense Forces."
http://www.jafi.org.il/education/100/concepts/d1.html