I agree with being cautious when dealing with an unknown virus. But problem with taking draconian measure is that they cannot last, cause devastating economic outcome for those who can least afford it, divide the society further, and may not be even necessary in the light of the latest data.
They may in fact cause the spread last longer and cause even more damage, as once we end the lockdowns, people will inevitably go back to their old habits with the virus still there.
The data from South Korea shows that from a total of 250,000 people exposed to the virus and tested, only about 8000 tested positive. A study published in Lancet following two patients afflicted with the virus and testing all those they had come in contact with them also showed that casual contact most probably does not cause the spread of the epidemic.
The best way to fight this virus is the old fashion way: wash your hands often, stay home if you are sick and keep a bit of distance. We can do this!