I worked in a Haskell shop, and later in a Clojure shop. In both cases, engineers were happy-go-lucky about every security or privacy concern under the sun. Often they seemed to believe that being functional saved from having to worry about validating their inputs, checking authorization, or (absurdly) having access control on their critical data stores. They told me as much on several occasions, and exhibited no interest in altering these beliefs.

As you might guess, this drove me nuts. In both cases it eventually blew up in their faces and the events proved to be free of side effects. Their imperative colleagues did not have the same mindsets.

If those two shops are in any way representative, then it may perhaps be worth considering very carefully if keeping cool new technologies away from serious usage could in some scenarios be a win.