In a similar vein, W. Kip Vicusi has studied a number of public policy matters that are adopted on faith, and persist "for no good reason."
So-called "child proof" caps on poisons increase the rate of poisoning.
The purpose of so-called "child proof" caps on poisons isn't to decrease the number of poisonings. The purpose of so-called "child proof" caps on poisons is to decrease the number of lawsuits for negligence, after poisonings inevitably occur.