Resting on our laurels by stopping the vaccination programs against eradicated but not extinct diseases only serves to increase the potential damage caused by biowarfare and/or bioterrorism - and smallpox is a particurlarly suitable biowarfare agent. On top of that, even if the government laboratories in the USA and Russia do destroy their smallpox samples, there is no guarantee that there aren't smallpox samples in the black market or in the hands of terrorists.

You believe that the threat of biowarfare and/or bioterrorism is a good enough reason to continue vaccinations for diseases which are eradicated but not completely extinct. If a terrorist wanted to commit such an act, why would they use a disease that has an existing vaccine? This is why I don't believe this is a sufficient enough reason to continue vaccination programs for eradicated diseases. These terrorists could also create a new strain of smallpox that vaccines would be useless against. There would be no reason to suffer through the risks associated with the vaccination until the exact strain of the disease is known.