on why villains monalogue

I have often wondered in the middle of a not so great movie, why the villain just stands there, talking, instead of just killing the hero. I thought about it some more tonight while watching one of the older Batman movies. Really, it's all in Dante. At this point I should like to point you to my professor, who wrote a great entry on this topic, but it has disappeared, so I'm afraid that you are stuck with my ramblings.

I should like to try a thought experiment, and I will write it out in the form of a dialog (I will be playing both parts).

( cut to save your friends pages, as the line breaks make it seem long )