The rate of child deaths due to unintentional injury has fallen by over half from 1970 to 2007 for children 1-14.[1] With the current population of US children, this means about 100-200 fewer child deaths per year.

Consumer protection lawsuits have done a lot to keep people safe.

That said, there needs to be balance. Keeping kids indoors for fear of kidnapping is ridiculous. Keeping kids away from real science is also probably a bad idea. But modern playground equipment safety regulations, as an example, are really good, even if they do mean no more spiny things.

[1]: https://www.hrsa.gov/sites/default/files/healthitBACKUPJan6-...

(My stated conclusion is not directly said in the fact sheet - compare the pie charts and reference the line chart to verify.)