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Of all the people in the world I can think of with the inability to think outside the box, Rich Hickey has to be at the bottom of the list :)

Different people have different boxes.

You know CL doesn't have a set type, though, right? It supports lists because it has to use a different data type. This turns several O(1) set functions into O(n), however.

Also, are you sure vectors are supported in CL? Looking over Common Lisp the Language, the adjoin/member/intersection functions only mention lists.

Finally, it's not even clear CL won't return buggy values, either. From the documentation on CL's intersection function: "If either list has duplicate entries, the redundant entries may or may not appear in the result." So it's just as GIGO as Clojure.

>union and intersect not doing the same thing as in common lisp

Clojure is a different language.

Clojure is developed by a team.