You'll note that this case caused exactly the kind of outcome I'm talking about: Pollard was an anomaly (to my knowledge, the only recorded case of a US citizen spying for a US ally) whose activities caused a massive intelligence break between US and Israel that lasted for years and probably did more damage than "good" it served for Israel's intelligence apparatus[1]. That kind of lesson is hard-learned and probably not forgotten, regardless of the fact that Pollard is a poster-boy in Israel's version of a culture war.

[1]: https://www.thedailybeast.com/israeli-spies-arent-exactly-re...

Julius and Ethel Rosenberg were also US citizens spying for a US ally, at least in theory. Though the Soviet Union had stopped being an ally before they were convicted, of course.