Risk is a continuum. When it is unknown the people interested in risk accept it. Eventually people learn the risk model and change behavior based on that. As an example of newly known:

All models of Onewheel electric skateboards are being recalled after the maker Future Motion received reports of four deaths of users between 2019 and 2021 and multiple reports of serious injuries.

https://www.cnn.com/2023/10/01/us/onewheel-electric-skateboa...