This may be true in specific cases... But surely isn't true in general.
It's the role of science and government to find out which anti-biotics, which hormones, and which pesticides case increased rates of which cancers.
As soon as there is evidence suggesting a specific pesticide has downsides that outweigh the advantages, it's time for the government to promptly ban it.
So far, I think the main failure in that process is that governments don't put enough money into science to find said evidence. Simply having a tax on biotech of say 1% to pay for independent scientists to do research would easily be enough to give us good evidence of the upsides/downsides of everything widely deployed.