Vaccination is one of those scientific topics that's just like evolution: doesn't matter how many facts you smack the fanatics in the face with, there will still be idiots that insist it's wrong for completely unscientific reasons.
And to the poster that thinks they get sick more often after getting the flu vaccine: vaccination, by definition, causes your immune system to go into an active state which can cause you to manifest symptoms even in the absence of illness. Believe it or not, the uncomfortable symptoms you experience during illness are usually the result of your body's attempt to fight the illness rather than the illness itself. By way of example, fever, runny nose, cough, and excess mucus production are all a result of the body's attempt to fight a cold rather than the cold virus itself.