Others can argue the 'gun issue... but
the Kinder-surprise is illegal (in it's proper form) Because of a Law Regarding the amount of 'Not Food' that can be inside of Food, a sensible law in it's Intent when you consider that, right?...
Also consider that the US is a 'law suit happy' society and yet People will still snort Condoms and Eat Tide Pods by choice... how long before some moron would pop an 'egg' in their Mouth whole and try to sue for poisoning, or choke on it and die