There's something truly evil about biological and chemical weapons, especially the former. I don't think we should have them in our arsenal. Atomic bombs are sufficient, as far as WMD are concerned. The intentional spreading of disease is truly sick, and could very well backfire on us if we ever resorted to it.
Which is exactly why the 6' long sign on the front of my house says:
Save BILLIONS of lives
Stop Saddam NOW!