[Reelin]

> my disagreement is your belief that biological warfare is readily available to small groups or individuals

As a counterexample, have you considered that much of the cutting edge biological research takes place in academic labs? The vast majority of those would fit the definition of a small group, and many of the projects they undertake are conducted by only one or two individuals. The level of expertise required and difficulty of learning the material are the main barriers to entry for outsiders.