Because life isn't only happiness? I want to see this movie to have the same tone as Messiah, I think society at large is due some injection of "beware of personality cults" reminders right now.

Also, the "downer" Empire Strikes Back is still considered by many to be the best of the original Star Wars trilogy, despite getting panned for being too much of a downer right around the Christmas season when that came out too. I remember one reviewer saying something to the tune of "like receiving a Christmas card from your bank" or something to describe the disappointment they felt with the entry when it came out.

[–] panthera_@lemmy.today 1 points 18 minutes ago

People already have a lesson from following personality cults in Adolf Hitler. No, life isn't all happiness. That's the reason movies should be an escape from unhappiness. Through Paul and Chani viewers can feel romantic love, a love which they perhaps do not have in real life.

But viewers knew that there would be a sequel to The Empire Strikes Back and the sequel, Return of the Jedi did have a happy ending. However, Dune Part 3 is the last of the trilogy. Note that the final Spider-Man trilogy, Spider-Man: No Way Home was sad. Why this love of dark endings?