There have been multiple breaches resulting in contagion escaping at US Level 4 bio facilities in the last several years, one recently.
It is not a matter of increased risk, it is a demonstrated fact that it can happen.
So, co-locating critical infrastructure with these labs is not prudent.
Having a military base in the same state is not a threat, and there is no conspiracy to take out that Air Force base in Nebraska by sending this Ebola patient to the Ebola clinic there.
There is also no conspiracy in locating our bio research labs where they are.