Neither there is scientific evidence that a wall will crumble or that an electric plant will cause an electric shock when
engineers deny qualifications to buildings. Neither there is scientific evidence that you will be eaten by a shark if you dive into the sea of Tasmania, though there could be a "SHARKS no swimming" sign nearby. It's a matter of reasonable risks, often codified with technical rules, norms and laws.
There was an
earthquake swarm going on for months when they said there weren't risks. In many Italian towns you cannot drive trucks, and oftentimes even cars, to the center of the city because vehicles produced vibrations can damage old buildings (and that's true), yet after months of strong vibrations they just reassured the population without considering a check-up of the many old buildings of the area, nor of the important buildings (e.g. hospitals, offices) that should work 100% in case of disasters.
If I, as an engineer, certify that a plant is safe when it may be not, I can be jailed. I can't see why the same can't apply to this case.