pedant says...
-> Thank you for confirming my point. I wrote that scientists are not always right. What a pity that the first groups of scientists who said such and such was safe can't be force fed the excrement they created.
Thalidomide is safe to those taking it (people still take it to treat leprosy), however it is not safe for fetus at a certain developmental point. Now how many pregnant women do you think were in the initial drug trials? same number as are in pretty much all drug trials - zero.
There is never zero risk, and sometimes the consequences are horrendous, but new information comes to light and conclusions change.