The first time they freak out and go to the doctor, who tells them to look for it in their kid's poo. The second time they skip freaking out and the doctor step. Parents may not realize magnets are much more dangerous, because magnets, especially strong ones, are unusual objects that we don't have a lot of experience with, and for their size are unusually strong.
On the other hand, a reasonable man may not realize that swallowing magnets are far more dangerous than swallowing similar objects that aren't magnetic.
They just seem to see the warning labels as an example of "health and safety gone mad" so to speak, of someone putting unnecessary warnings on about something that obviously can't be that dangerous. I can't see a good way of avoiding this problem.
Edit: Apparently there were similar comments in the previous HN discussion; at least one person[1] failed to grasp how much more dangerous they were if swallowed than other objects despite reading a 14-page complaint that described in graphic detail the exact mechanism by which they were more dangerous, the serious medical consequences, the long-term health risks even with prompt and successful surgery, and the history of kids being injured in this fashion by them. They're basically impossible to sell safely.
It's just that apparently there aren't all that many reasonable men. u_u
Also, a stupid person eating them probably won't eat them in that pattern, finding one by accident, then another an hour later after the first has advanced through the system ahead of the second, which is how the flesh gets pinched eventually.
Should we ban knifes now because children could cut themselves?
The idea is that the product is more dangerous than appearances might let on.
I allow them to play with it for a little, and then I put them in a safe place I know the kids can't get at them.
If I leave them on my desk, I know they will get it...so I don't leave them on the desk.
If a 12-year old is swallowing these things, there is something else going on in that household that needs to be addressed.
Or rather, how does one treat the sale of adult toys.
Living in civilization is all about giving up our freedom to do certain things in exchange for the protection and comfort that society offers.
Living in a civilization is about joining a social contract to not infringe on each others rights. (theft, rape, murder, etc infringe on the victims rights, where as buying Bucky Balls does not affect anyone but the purchaser)