It would only be disingenuous to act surprised if they knew about it before. The Government the Right Wing especially, has dedicated their lives over the last 40 years to make sure as many citizens as possible be denied an education of be denied a valid education.
Most people aren’t surprised as if they never knew, they are indignant because they were lied to, big difference.
It’s not that we didn’t know there was lead, its that the last generation promised they got rid of the lead. and it is time that generation pay for its crimes against humanity.
Blame the perpetrator not the victim, and especially don’t blame the victim advocates.