It seems to me biological weaponry would be a much more rational choice for rogue states such as NK and Iran, for so many reasons.
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Research is cheaper.
Bio-weapon research is usually much cheaper than nuclear research. Rogue states are already greatly impoverished by trade sanctions. Bio-weaponry are much more cost-effective. Why devote so much resources to nuclear weaponry research when the rogue state can use a fraction of it towards bio-research and create an array of various infectious agents that can wreak havoc to the whole world? -
Easier to obtain the revelant resources under embargo/sanctions
Nuclear materials and equipments are tightly controllled, for rogue states under sanctions especially so. On the other hand, biological equipments are much easier to obtain.
For virus and other infectious agents, they can be obtained by sending some medical teams as foreign aid/humantarian operation, or special agents, whatever is convenient. Soviet Union obtained viruses such as Ebola that way, the rogue states can too if they want to.
For equipments for the labs, they can be obtained via the civilian market. Moreover, given the nature of medical equipments, many of them can be obtained as humantarian aid (which are permitted even under strict sanctions).
- Easier to disguise, and to “blend-in” with civilians (human shield effect)
You can basically set up a bio-weaponry lab under a large civilian hospital, making the Israeli-style air strike practically impossible unless the oppossing country is willing to face fierce international outrage for attacking a civilian hospital.
For those don’t know about the Israeli-style air strike I’m talking about, well, Iraq had its nuclear ambition thwarted by Israel with its co-ordinated air strike, destroying their nuclear facility. Israel is threatening to do so again to Iran as well. Fact is, you can’t as easily hide a nuclear facility as a bio-weapon lab.
- Delivery is “economical” and much harder to intercept
For rogue states to deliver nuclear weaponry to, let’s say, America, they will have to either do it via
a. conventional means, such as airplane, missiles. However, they are expensive to research and manufact, and prone to failures (NK failed many missile/rocket tests), and they can be intercepted.
b. Special means, such as transfering a small nuke, could be even suit-case sized, via cargo ships. However, nukes are easily detected because of its radiation, smuggling a nuke to a western country is no easy task.
Bio-weapon on the other hand, can be very easily deployed on enemy land. They can be delivered during peace-time to western countries via the airport, cargo ships etc. Much harder to detect than nuclear weaponry. Heck, you can put them in a water bottle and the custom officers won’t have any second look, or you can put some capsules containing the infectious agents mixed in with vitamin capsules, who the heck would know the difference?
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Spreading is easy and fast
So we covered the delivery, what about performing the actual attack? Easy, just deploy some sleeper cells awaiting orders. The sleeper cells would intentionally spread the infectious agent when the order is given. Places with high population density and acting as transportation hubs can be given high priority. Deployment in a major airport such as JFK airport would ensure the entire western world to suffer in just a few days. -
Effect is way more long-lasting
A well-made infectious agent or a group of infectious agents can paralyze an entire country and even the whole world. A nuclear explosion in New York may sound terrible, but it’s just the NYC. If a virus gets spread, its the entire world at stake. If the virus is made to infect both humans and certain animals, it would be practically immortal. If NK made a virus that can infect both humans and bats, the world would be tormented by the virus virtually forever. The bats would act as hosts and even after initial containment, the virus would still spread to humans periodically, like Ebola. -
Nuclear attack solidify a country, a bio-attack creates distrusts
A nuclear attack will just be another Pearl Habor, or Sept 11 attack, albeit an “enhanced” version. A bio attack however, would create mass distrust among the populace. Everyone would be afraid to be infected, everyone would be paranoid of other people, the very culture we are living in would collapse. No more parties, no more shooling, no more meetings, no more night-clubs etc. In short, it changes the very world we are living in rapidly.
Anyone who has watched some zombie apocalypse movies/shows know how much distrust an infectious agent can create. Keep in mind the incubation period is only a few hours for a typical zombie virus commonly depicted in popular media. What happens with a real virus with a much longer incubation period? It can be assumed the paranoia and distrust would be even greater because you never know if the person sitting next to you is infected or not. Everyone is at stake, and therefore everyone would be paranoid.
Given these factors I listed (you are welcome to add more), I think from the perspective of rogue states, it is in their best interest to shift focus from nuclear weaponry onto bio-weaponry . Bio-weaponry is ideal for a rogue state.