As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.
Ebola is an example of a locally-originated virulent existential threat open borders fail to contain, biological, social or otherwise. Controlled borders, despite all the issues, at least can act as an immune system of sorts.
Define "controlled borders"? In the "open borders" context the debate is usually about residency and citizenship restrictions, but in the context of ebola those don't matter; tourists and airline workers and cargo ship crews and so on all carry diseases too.