Because the examples you&#x27;re giving are clearly ridiculous, even to the layperson. Obviously planes <i>can</i> fly, nobody has ever gotten their soul sucked out by a vacuum cleaner, etc.<p>Now first let me say I think vaccines are a Very Good Thing, but people have actually been harmed by vaccines: it&#x27;s extremely rare, and happened more in the past than it does today, but it <i>can</i> happen which makes it much harder to shake peoples&#x27; paranoia.<p>Believing electricity can read your thoughts is clearly crazy, but believing vaccines are harmful <i>can</i> just be a case of not understanding&#x2F;respecting the probabilities involved.