Ah this old chestnut. Trailers do an awful lot wrong, to the point where your whole quality of life is actually improved if you ignore them entirely. There's so little restraint across the multiple trailers each big release gets that you end up piecing together the major plot beats whether you want to or not; just look at The Amazing Spider-Man 2, which even went as far as to include its final sequence verbatim. It's not just in making a movie pointless where trailers have a negative effect, however. We still have this warped expectation that trailers are teases of what's to come, so even if a crime of Spider-Man-level proportions is committed, you expect to get something more. Oh look, a helicarrier crashes in Captain America: The Winter Soldier, I can't wait to see what happens next... oh, that's it. They sell the movie, but don't care if they ruin that same movie in the process. And that's saying nothing of the movies whose trailers completely and utterly misrepresent it. Drive painted as a Fast And Furious-esque action flick and Sweeney Todd not as a musical are just two hilarious cases that have got people making official complaints.
