the original storyline ended with this quote from Dune:
I know the evil of my ancestors because I am those people. [...] I know that few of you who read my words have ever thought about your ancestors this way. It has not occurred to you that your ancestors were survivors and that the survival itself sometimes involved savage decisions, a kind of wanton brutality which [civilization] works very hard to suppress. What price will you pay for that suppression? Will you accept your own extinction?