Apart from the radium toothpaste and giving kids in development unnecessary, dangerously large radiation doses, you have a point about excessive caution being p

Apart from the radium toothpaste and giving kids in development unnecessary, dangerously large radiation doses, you have a point about excessive caution being problematic. But there is a NIMBY-like concern here: I don't want to be in the early adopter group of a technology like this unless my life depends on it. Others are free to go ahead as they choose, and it is nice if this quickly reveals the picture of danger and helps create beneficial technology. But I won't be on the bleeding edge of this development. I guess my point is that there is a middle ground between jumping in headfirst (radium on your teeth, nano-coating on your cutlery) and being excessively careful and always covering your ass (contemporary life-saving experimental medical treatments).