Being a peninsula country gives you an advantage (relatively fewer border towns to worry about), it doesn’t give you immunity if you fail to do anything and let

Being a peninsula country gives you an advantage (relatively fewer border towns to worry about), it doesn’t give you immunity if you fail to do anything and let the epidemic take root within. In addition, being a special kind of peninsula country where anyone who crosses your border can be shot without questions helps out big time compared to other peninsulas, hence the emphasis on “an island for all intents and purposes”.