Now why are saudi publications, especially text books on Islam etc, which are used in american islamic and british islamic schools not sued for libel, exhortation against other religions etc?

Saudi schools erected on North American soil are on real estate that is private Saudi property.

Some of the schools might not be of the “madrassa” variety (you know, where geography maps don’t show the non-existent state of Israel), but it’s difficult to say or know since the schools are highly private enclaves.

They must meet certain parameters to stay “accredited” (so their graduates have “real” diplomas), but I would imagine oversight of academic content is minimal.