What is the logic of high context language?

It is said that Japanese is high context language, American is low context language.
but when they have meeting, Japanese would be silence when they agree, they only speak out when they disagree. American would speak even if they agree. So japanese would see American disagree that. so in this situation, it is said that japanese become low context language? in my opinion, It is also like being conservative to hold high context language without point up shame point, so use high context language. It is their will make but like cousin and snow in English is nothing more to describe. Not like a nation describe snow in 14 or 40 ways. Does that mean American is easy to commit incest?
What is the logic of high context language?
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