Earlier quoted context omitted.
IARC is not a regulatory body, and its categories do not address disease risk. Maybe FDA got this right. I bet you dollars to donuts that putting TiO2 on your skin reduces the risk of cancer.
The FDA... Which doesn't do it's own studies and trusts the study results of the manufacturers who want to sell their products?
Why would FDA do its own studies? It's a regulatory body. (Do you know what NIH does?)
"My smoke alarm is no good because it never turned off my stove."