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.
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.