What would you have them do instead?
So, China controlled its spread by shutting down entire cities, and as we saw, a lot of humans rights abuses. I'm not talking about this level of control but we could
Close schools - kids are known spreaders of germs, and closing schools during the 1918 pandemic they believe helped slow the spread of the disease.
Put the message out for people to work from home where they can - discourage people to go to work if they have the option to work from home
Limit air travel to essential travel only - allow people to cancel and change holidays to end of the year/next year for no charge, discourage air travel. For travel to most affected countries, some sort of screening should be present in the airports. Granted temperate scanning doesnt catch all cases but hey, if it catches a few then surely that better given one person can go on to spread it to another 3.
Stop major events taking place, sports to be done behind closed doors, theatres encouraged to delay performances. People then encouraged to not go to restaurants, pubs, cinemas etc.
At first we can do this in affected areas, and expand when needed. That was the NHS resources in that area can control their demand, and we try and stop the spread outwards. Seeing people talking about how cheap holidays and air travel is at the moment I just find to be hugely irresponsible and contributing to the spread of this virus at a time when we should be restricting our movements and the places we go to.