Answer:
Because a lack of confidence leads to fear and fear prevents progress.
Step-by-step explanation:
Lack of confidence is a feeling that arises out of fear. Regarding the advances that the world is experiencing, whether in science or technology, many people are afraid of the results that these advances can promote. Even though many tests have been done to prove that progress promotes good and positive results for humanity, people cannot lose their fear about possible bad results. In this case, fear promotes a lack of confidence and this means that people would rather be without progress than trying to improve society at some point, even though there is a very small possibility that bad results will be seen.