"If the other fellow can't tell you his story, you can never be sure he isn't trying to kill you." Why can't the two races communicate? Why is this important? What are three reasons that have been given for the buggers attacking Earth?
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You need to ask your questions one at a time. Graff explains why the Buggers are so hard to beat: they are a community. They all communicate on the same level: a level far above human crude communication. The Bugger's telepathy enables them to act as one while being separate entities,
“What one thinks, another can also think; what one remembers, another can also remember” (ch.13)