People tend to like certainty. One of the things that people get wrong about science is that they think it should provide them with that certainty. But scientific conclusions, while they tend to be the most reliable that we have at any given time, can change in the light of new evidence which is why results are usually phrased conditionally. Unfortunately that nuance is often missing when the media reports science results and this can be disconcerting for some people when new results seem to contradict the old. I deal with this question quite extensively in my book The Great Paradox of Science.
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