[xbmcuser]

Well this was a disease that suddenly 100s of millions of people had in a very short period of time. Ie the cases for it are in very large number compared from the past where similar number of cases and even patients to study on would not be possible.

[jMyles]

Sure, but when data did become available (eg, the diamond princess dataset), most reasonable scientists changed their minds. The policies however did not change, and instead continued down a non-evidentiary path.