Do you think we should stop allowing Americans to go to Africa in order to treat Ebola?
No, just quarantine them before returning.
No, that's ridiculous. Africa is a huge continent with many countries, only a couple of which have had Ebola outbreaks.
Sorry I misread the question. But still my answer is that's ridiculous.
Absolutely not. The best way to protect ourselves is to help the affected area of Africa deal with the disease. We (and others) should have been doing this to a greater extent decades ago.