Concerning the level 2 pathogens, if you consider the risks associated with working with these pathogens, the risks or the remote possibility that terrorists would use them to cause harm, and then you consider on the other hand the constraints--financial, etc.--on researchers working on level 2 pathogens, it's not worth it. The best solution is just to remove that list of pathogens from the bill.
Nobody disputes the fact that you need to protect people who work with level 3 and 4 pathogens. Just protect the people themselves, their co-workers, the people in the same building, and then the people outside the building. Nobody disputes that fact.