Asbestos certainly has never been proven to be safe. There has been data to suggest a statistcal link, and a plausible mechanism.
Lately, these results have come under scrutiny, but that doesn't change the fact that thrity years ago, it seemed like a good idea.
Exactly- I have info on the Asbestos Swindle ( and some other frauds ) here:
Scams, Scalawags, and an all-too-gullible Public...famous frauds sold to America