The franchise is a recreation of Valhalla. For the vikings heaven was a place where warriors fight and kill each other all day, are revived at night so they can party in the beer hall. The next day is the same.
What makes starwars even less hopeful is that the force is both good and evil. So why even bother fighting? In that universe Evil will always “balance” out the good. And there can be no meaningful wins or losses. It’s karmic fatalism which is exactly as nihilistic as you say.
For me the films best moments were the ones that show an appeal to conscience. (Much like the nazis in “Ordinary Men.”) No matter who we are, we always have a choice to disobey corrupt orders.