All the information about the FLLF comes from Bergman's book. The information in his book comes from Israeli officials involved in the operation or who were aware of it at the time
nytimes.com/1982/08/29/opi…
Note of course that all the arguments at the heart of Israel's discourse on "terrorism" today are already present here ("they" are entirely evil, "we" only defend ourselves, "we" respect human life, "they" don't, etc)
This is, of course, why the absolute SILENT of media (& "terrorism experts") about the FLLF is so important: without such silence, whole discourse would collapse
END