I always had a problem with this episode - not helping the Valakians. Yes they would have been interfering in the evolution of another planet, but I don't believe that justifies allowing an entire species to die out like they would have been doomed to.
) had a secret high tech terrorist organization that brought down the Valakians... but it seems just a bit farfetched, even by Trek standards. And Trek standards allow for random human to salamander transformations and ship's doctors having steamy romance with lamps.