In spite of the section that alluded to safety features, consumers around the world may still ask this question. For the most part, granted the system you invest in does have several of the aforementioned safety integrations and is compliant with strict safety standards, they will be safe to use. But, for enhanced safety, the station will not emit an electric charge until you physically insert the nozzle into your connector.
Oh yeah and even if you were to accidentally drive off with the connector plugged in, your car would not allow it as it will not move while the charger is connected. All in all, safety is typically not going to be a concern.