If you’d care to start a GD thread, I’d be happy to contribute. The OP asked about the marketing and withdrawal from the market of lawn darts, which I attempted to shed some light on. This forum does not seem me to be the place to argue about the regulatory role of the federal government.
Gee, I wonder who finally wound up with that pristine set of Jarts that was on e-bay? 
For everyone who is baffled over the banning of lawn darts, here is an article from The Onion. Hopefully you will find this as amusing as I did…