So I came up with an idea a while ago. I decided to write about a civilization struggling to rise from its ashes after being completely destroyed by a villain and his minions. I started to create the setting and then realized it would be easier for people to understand the book if I wrote a prequel, where the destruction of said civilization would take place. Here's my question : is it okay for villains to actually win ? I'm guessing such an outcome would be pretty disappointing for those reading the story, but I don't really have a choice either. I actually asked the same question on another forum and the users didn't really think the evil ones could win because "readers wouldn't like my book". Please help me, I can't figure it out.