It’s probably going to be a pretty sick “army” soon if not already. They are never let out of the cages. Nuking it would be overkill and too dangerous for others due to the fallout. Conventional bombing wouldn’t guarantee survivors and escapes. Either way, destruction of the facility would probably require an eventual rebuild.
A lethal chemical weapon or a virus with a high burn rate like Ebola would be more effective, could be contained and not permanently contaminate the site.
I never thought of nukes. Bunker buster conve too also would work too