How so? It's common knowledge that the nascent IDF absorbed terrorist organizations like the Irgun and Lehi into their ranks and gave them autonomy to operate as they had been. Leaders of these terrorist organizations went on to join the highest ranks of Israeli leadership. David Ben-Gurion being one of many (his Haganah cooperated closely with the Irgun and Lehi as they committed kidnappings, bombings and murders).

This isn't a conspiracy theory, it's widely documented by respectable historians.