I thought the best overreaction was the mayor of SF declaring a state of emergency despite not a single person in that city having contracted the virus. Decontaminating airports is about keeping peace of mind up and continuing commerce, tourism, etc which probably only adds to the panic in the long run.
No one said don't be safe. I wash my hands often and try to remember to make my daughter do the same. I keep tabs of where the infected are. I wouldn't take my daughter to daycare or go to work if I thought infected people had been through there. But it ain't the plague! The 2nd worst part about COVID-19 is the hysteria wrapped around it. I pity the poor folks sitting in quarantine, reading the headlines, watching news stories showing grown adults with water bottles and maxipads taped to their heads, and scared worthless about what comes next.
The worst part about COVID-19 is that the incubation period is thought to be as long as 14 days, during which it can be spread. Add to that how contagious it seems to be, and we may all end up getting it. The vast majority of us will get through this relatively unscathed either way.