Re: most "wrong" episode...
Later Kirk escapes from them, calls a truce, gives them aid, calls them friend and sets course back for home without any mention of bringing the aliens up on charges.
You seem to forget the Kelvans still have an impressive tech edge over the Federation. I doubt the Federation could really keep them locked up if it came right down to it.
Self-appointed Knight of the Abrams Table! - Thanks Marsden!