The live adenovirus (engineered to express a rabies protein) is not entirely safe. It won't give you rabies, but it does infect you. For wild animals, it's ok if some small fraction die from it.

They should spread some of these around my town in central NY; we've had rabid animals recently (cat and fox).

The pellets can cause localized infections or rashes to humans. More dangerous to certain groups like small children, pregnant women and people with immune system issues.