The thing is, disaster is always about to hit. It’s a dangerous universe.
I completely understand that Ebola could be an epidemic, even a pandemic… but so could a lot of other diseases. One reason we pay more attention to Ebola is that it is frequently lethal and kills in a spectacular manner. We didn’t pay as much attention to the spread of West Nile Virus, even with some deaths, because MOST people never became sick from the virus (only about 1 in 100 or 1 in 200 ever show symptoms) and those that did, even those that died, weren’t doing oogy horror-show things like bleeding out.
A total of five people having or having had Ebola in a nation of 300 million is NOT an epidemic. Not even close. Granted, two of those five were infected here, but if three infections only generate an additional two infections it’s not a growing problem. If we can keep that up (and there’s no reason we shouldn’t) then even if another person wanders in carrying the virus we’ll be able to keep it confined and it’s not going to turn into an epidemic.
Now, yes, there is a non-zero chance circumstances could change and we could get some sort of wider outbreak. There’s a non-zero chance a rock could fall out of space and land on my head tomorrow, too, but I don’t worry about it much, if at all.
We can identify the disease. We know how it spreads. That alone should allow for effective quarantines to reduce any spread, and once you keep an illness from spreading eventually everyone in the quarantine zone is either deceased, recovered, or managed to avoid getting infected and life goes back to normal.
The biggest danger is, yes, complacency, but that’s complacency while, for instance, screening people with high fevers seeking medical help, or failure to check people at international borders, and things like taking body temperature can be done without actual contact with the people being screened, or monitoring agencies failing to track various diseases. That’s different than the average person who stops worrying about it because they aren’t traveling to/from an area with an outbreak, they aren’t having any contact with people fitting that description, and are unlikely to run into someone of that description.