The attraction of bioweapons is they're just so damn CHEAP! It only costs a few thousand dollars and you can potentially kill hundreds, if not thousands of people. As previously mentioned though, the downside is they're somewhat uncontrollable and can spread further than intended (although in some cases that's exactly what the attacker wanted anyway). Persistence is another major factor (such as the anthrax issue) and can be EXTREMELY difficult and expensive to clean up.
Part of the Anthrax problem in Zimbabwe is the climactic conditions there are almost perfect - usually warm if not hot, wet periods followed by long dry periods. Korea may in this case be somewhat blessed by having a very different climate rather more hostile to the disease's long term survival.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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