Spotted...

Why should you care? I mean seriously, I don't give out a lecture or advice with every bike part I sell, if someone wants to buy something let them buy it and what they do with it afterwards is up to them, if he wants to be stupid and ride with no retention let him and all the other idots that do it do so, then when they crash and break their face they'll learn from their mistake :).

don't you want to leave the world a little bit better than it was before?

there's a slight different in simply preventing someone from getting harm (or worse, killed), and/or get their bike stolen the moment they brought it, and making sure that they object the NJS rules of every single part is perfect for their bike.