That's because you use ridiculously vaguye language like "easy to transmit". You need to specify the conditions under which the potential transmission takes place. What peoiple don't realize is just how primitive conditions are in Africa, and what a difference it makes. These are countries where medical providers re-use latex gloves, sometimes even hypodermic needles. Granted, this guy was part a medical mission that probably had all the protective equipment, but you have to keep in mind that the primitive conditions that preceded them meant that there have been some TEN THOUSAND cases in the region.
It's immensely labor intensive to take care of an Ebola patient, especially with the precautions required by close contact., but the overwhelming numbers introduces yet another deadly risk factor: fatigue.
So yes, I suppose you could say the medical personnel who contracted Ebola are stupid because they made a mistake under pressure. But what about the rest of us? This epidemic should never have got big enough to pose a global concern. It was our choice to cut the CDC's emergency preparedness budget to a billion dollars below the FY 2002 mark.