It seems to me the real danger with all of these toys would be a lack of parental supervision.
For example, we lost radium to the nuclear fear-mongers, and even now, tritium is a super controlled substance, allowable only in very small quantities (in my experience, so limited it doesn’t actually generate enough light, when it is used for that purpose with phosphors).
Even the Europeans allow enough tritium to be useful, as there are very cool lighted key chains that use tritium, that are outlawed here (free Americans, funny, hehe, harhar).
I think what changed, was not that children became more blunt in their childhood IQ, but that parents were more interested in things that took them away from their children, even in the environs of their own homes. So bothered in fact, a lot of people just skip having any kids nowadays.
Caltrops! More Caltrops!