There seem to be more things that are _known_ to be dangerous, but these things obviously were dangerous even when we didn't know they were.
I moderated a really controversial article once and as a result I stopped getting moderator points (as I expect did anybody else who moderated in that discussion, because I promoted comments on both sides of the issue). Since I can't mod you up, I'll just say "good point" in hopes that you get modded up some more.
Taking your comment a step further, this is "Good news, everyone!" because when we know these chemicals are bad, we avoid them. Not all of them are regulated, but manufacturers know people care about their kids safety so they avoid using chemicals shown to be bad (like BPA). That doesn't mean kids are no longer exposed to all of them, but I'd wager they're exposed to significantly fewer of them in smaller amounts than we were as kids.