>>>Why is it wrong for an FBI agent to pose an Israeli in order to catch a gentile American who is willing to sell out American secrets for money?
Can someone explain it to me in rational terms?<<<
It is not wrong, it is excellent and necessary counterintelligence.
Israel is a prime candidate for “False-Flag” recruiting of agents, since they are perceived as a friendly country, and even beloved to most American Jews.
While most American scientists wouldn’t even consider working for Russia or Al-Qaeda, some might consider helping out Israel a bit. This opens them up to False-Flag recruiting by evil powers.
(e.g. of false-flag recruitment: Let’s say Al-Qaeda had an operative who was an Arab-Israeli, grew up in Israel, looked Israeli and spoke Hebrew perfectly. They used him to recruit an American defense scientist by convincing the scientist that he was working for the Israelis. Ok, he says, the Israelis are friendly, so I’ll hand over a few nuclear secrets to help them out. But, in fact, he is really handing over secrets to an evil enemy.)