Yes and we also let children work in factories, mines etc.. We also didn't have road rules for example. Also regarding your example of fireplaces, the fireplace

Yes and we also let children work in factories, mines etc.. We also didn't have road rules for example. Also regarding your example of fireplaces, the fireplace was obviously dangerous, a treadmill standing somewhere is not obviously dangerous. It's funny because the consequence of the argument around not expecting companies to build safe equipment is that parents should be constantly watching their children because something could be potentially dangerous. It achieves exactly the opposite of what how our grandparents grew up.