We are worried it seems that science will one day play with thing we aren’t meant to play with and that a disaster that will destroy the city/region/country/science. There are thousand of science fiction stories use this as a premises, where uncarefull scientist destroy the world with accidental plague, uncontrollable explosion, or some other unforeseen consequence. It as became part of our culture to the point that people distrust any experiment proposed by scientist. The thing is while technology as caused problem when badly misused and cause regional problem for humanity it as nothing to do with science and even then obviously not cause any large scale problem. Yes scientist can make mistake and some mistake could be dangerous but science is rarely someone else in the peer review process before any catastrophe catches the product of single scientist usually a mistake happen. Also scientist do not want to die anymore then anyone else and an experiment reward would have to be astronomically huge for scientist to even think of making an experiment that would have a 1/100th of a percent chance of cause a catastrophe.
Please, trust scientist not to endanger your life, they know what they are doing.