the saying was around long before Jonestown and Casey Anthony.
I would venture a guess that over 99% who use the cliche' have absolutely no reference to Jonestown or Anthony.
It usually has one of or all multiple conotations i.e usually in the vein of implying one not knowing what they are doing/talking about. And even if they do and the other disagrees the cliche' is used similarly. Hence it's much used status in political discussions.
Just as simple as that!!!!!!
btk
Very akin to the other cliche', you must be out to lunch!!
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