This is in fact purely a political decision: a nuclear power plant is in reality less prone to being attacked than a virology lab, and the consequences are way

This is in fact purely a political decision: a nuclear power plant is in reality less prone to being attacked than a virology lab, and the consequences are way less severe [1], then why should we expect the former to have much more stringent security rules? [1] unless you leave the nuclear reactor unattended in the hands of terrorists for days, they won't be able to extract any nuclear material (which would be the worse case scenario and only one comparable to terrorist stealing a vial of Ebola or Smallpox)