Our government is led by idiots, this is the result
Hate to break it to you, but nearly all governments are led by idiots who don't know anything and don't care to know. Becoming a non-idiot is hard, time consuming work that's incompatible with politics needed to get elected into a public office. At least our executive branch had enough common sense to ban flights from China on Jan 31st (and was panned by the "free press" and Democrats in congress for it at the time).…
There are probably thousands of infections in the country already, we just don't know it yet.