This is making the facts fit the prediction. For example, there are an average of 30 to 40 volcanic eruptions in the world every year. To predict the eruption of a volcano somewhere in the world is pretty safe. Wars, floods, droughts, etc. also occur continuously. Unfortunately, they never published or broadcast the prediction, so there is no evidence.
People have an amazing capacity for forgetting the wrong ones.
Another feat of clairvoyance is finding missing persons or objects, solving criminal cases and the like. No case has ever been solved in this manner. Investigators enlist the help of psychics usually as a last resort. It is usually done to persuade the public that they are doing something when they have run out of clues. It is also done to scare a suspect into giving himself up, since criminals are often superstitious.