I was talking about the villain forcing such a dilemma on the hero but it works equally well for the villain.
Another thing you may have noticed about these types of villains is that they all work through henchmen: Voldemort used many included a book and his younger self; Morgoth uses Sauron and balrogs; Sauron used Saruman and the Nazgul; the Dark One had half-men and the Forsaken; Palpatine (Darth Sidious) had Darth Vader. The point is that the ultimate evil was kept hidden from the audience. The audience has to figure out what it was planning through the actions of the henchmen.
And by having the hero only kill the henchman, you can write a sequel

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