Toxicological evidence takes a long time to acquire. By it's very nature it's a lagging indicator. Remember when everybody freaked out about BPAs? That's because good studies showed the accumulation of those compounds in the body, and the potential health issues it could drive.
And what about now that we have all these BPA free plastics? Most of them have replaced the BPA with other compounds. They haven't been studied, so there isn't evidence against them. But the absence of evidence isn't evidence of absence.
Finally: what, in their long and storied history, has led you to believe that 3M, DuPont, or Eastman are acting in the best interest of your health? Because their incentive structure favors wealth creation, not population health.