Sabotaging bad movies

Reading a story today about the new old Bollywood meme of rumor and gossip being used to sink movies, I wondered why the firmament isn't called out more often on this lie. When a star becomes part of a movie unit, he goes public with his choices. I'm curious about what drives these decisions. What makes a movie like Kites seem like a good idea? Who sells it? What does he say to make a star buy it? What does the star see? Who does he consult? How does his existence inside this space lead him to believe that a failed movie was not undone simply by its badness? That it was sabotage?

What I'd give to be inside this bubble. Can you imagine the delusion?