Fair enough. ^^ There's a point in there though, there's a lot of people that enjoy the full experience a story provides. Sure, spoilers don't have to reveal the events leading up to the "surprise", but the fact that the spoiler exists removes an element that people might not have expected. Even for people so out of touch as to not know a famous boat sank.
I'm not one to be bothered by spoilers (I'm pretty good at guessing them anyway), but I appreciate it when people do try to keep them under wraps - at least until it's general knowledge. I don't think treading carefully until it's made clear that most people know what happened and are openly discussing it is a bad thing. After that though, I'm also not sympathetic to those who join a discussion late expecting *not* to be spoiled.