Chiastic structure, in general, is used to define chiasmus over a larger body of work (paragraphs, chapters, an entire story), but the idea remains as above, with an idea or statement or something 'wrapped' within another idea. Bring justice to terrorists and terrorists to justice. Again, as George Bush's speechwriters wrote, we have justice surrounding and suffocating the terrorists in the sentence. The listeners start with justice and end with justice, and the terrorists are stuck in the middle. What could be better?