The article is focused more on future viruses. A bad thing happened now which was preventable.
We've got no nuclear plant meltdowns and no nuclear wars, because we applied security procedures learned from the past to the present. We have less killer quakes because buildings are built to withstand earthquakes now.
Most of these things aren't totally expensive to fix. They're a chain of bad events and all you have to do is break the chain at the weakest point. The Spanish flu was so deadly because people tried to bury it with propaganda and no quarantine measures were in place. At least today, we've panicked and taken action early.