When a business knows about security risks, hazards, whatever you want to call it, the businesses need to tell their visitors about those risks. That way people can decide whether they even want to go to the facility or they want to leave. If people know about the risk and they go there anyway, people know that they need to take steps to make sure they’re protected at all times, but if the business never tells people that their at risk then people have no opportunity to protect themselves and they don’t even know that they are in any danger.