Well, saying "it's that way because the devs said so" doesn't really seem like a good way to create a fantasy world where everything's supposed to be in character, but I guess that's sometimes the way things work. As for the idea Xordan gave of calling those of us who were involved in this RP "those crazy guys who go around talking about creatures which don't exist", that is not a good idea. Being involved in an RP which happens to be against the rules shouldn't cause our characters to be considered crazy, especially if they were perfectly fine before. It sure is a strange delusion when so many people get it at the same time... I'd rather go with "say it happened until everything's back the way it was before, then drop the subject" rather than make my character crazy just to follow the rules.
Anyway, I think we should bring this topic to a more positive and less argumentative point (although as you can tell, I do like a good argument). How about we come up with ways to do something similar to the vampire RP... without using actual vampires.
Basically, the RP boiled down to this: A group of people were cursed by a villain, and forced to kill/inflict severe injury on other people in order to survive. These cursed people have the ability to curse other people the same way. The curse forces those affected by it into hiding, and ruins their lives. Some people try to hunt the cursed people to prevent others from being killed, while some other people try to protect them and remove the curse.
That's really all there is to it. The key here is to figure out a reason why the cursed people would have to attack others that doesn't involve bloodsucking. If we can do that, we can have vampire RP without using vampires. Any ideas?