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The Constitution, while establishing the federal government, was a limiting document - limiting the powers granted to the federal government to the ones enumerated. They didn't want the same line of thought to be twisted when looking at the Bill of Rights where some favoring tyranny of the government would say only those rights stated and discretely identified are held by the people. The 9th Amendment was supposed to prevent that.

It's not hard to figure out why the 9th and 10th Amendments are not known or mostly swept under the rug when you consider the leanings of the media and education system (in general). The government, by it's nature in a position of power, would obviously tend to ignore limits on its own power.