"There's no reason to believe that any of our enemies has smallpox virus. Nobody has any evidence that any of our enemies has smallpox virus as contrasted with 1972 when we knew our enemy did have smallpox virus,"
He's wrong. There are plenty of reasons to think smallpox has been weaponized. Also, the ring vaccination system this doctor and others pioneered to stop smallpox outbreaks would not necessarily work with a highly virulent, weaponized strain. Here's a good link to an alternative opinion.
http://www.lewrockwell.com/orig2/miller6.html
If this guy got the possibility of eradicating smallpox wrong, why should we believe him now?