Jake, unfortunately we face much more than Ebola as threats. We have Ebola, Nipah, and several strains of bird flu, each having severa! Different places etc, as well as dozens of bar viruses alone which we have yet to discover.

Pandemics have the potential to spread via flights etc before we may even know what they are.

Sadly, there is no magic bullet to stop diseases from spreading globally due to our transportation and shipping methods

I understand the argument, and it may be valid at some point, yet we face numerous potential threats and could not always protect ourselves by these means.