Why does everyone not understand this decade ends Dec. 31st. 2010?

The year to end all years, January 2000 left us all with a pantry full of canned goods,and computers that adjusted just fine. The Millenaial decade is not over folks...we've got twelve more months to see if the world as we know it is going to end.
Update: A decade is ten years. You could have a decade that goes from 1955 to 1965 but "we" have decided on years that end in zero....except for the problem of AD O -AD1...BCE usually works this out
Update 2: everyone insists a decade depends on the 0 but it ain't necessarily so....go look at wikipedia
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