Hundreds of millions of people worldwide use public holidays and school vacations to travel alone or with family and go on vacation. You make your preparations well in advance to book a hotel and experience something. All of this has to be paid in advance and if something unusual comes up, it is usually very difficult or almost impossible to get these costs reimbursed.
At this point, already knowing that there could be problems, it is then weighed up whether the situation at your holiday location is perhaps overrated and it still makes sense to start the holiday because nothing will happen to you.
Although warnings from individual governments have already been given to the population and tourists in the country to avoid the gathering of people to protect themselves from infection, these warnings have been ignored, especially by holidaymakers who want to experience everything but do not want to miss anything.
Unfortunately, the Christmas, Chinese New Year and half-year school holidays are the triggers that the corona pandemic has become a human hostage.
If someone was already infected but was only noticed a week or later, hundreds of people could have been infected and they might have been at home or in another country for some time. You cannot blame the virus spreaders in such cases, but the spreaders, if a tourist should not blame others because he did not follow the published instructions to avoid crowds.
I just want to express that with a daily global passenger volume of over 10 million passengers traveling to dozens of different countries, it is almost impossible to get a pandemic under control worldwide.
This can only be done by partitioning the countries concerned and taking other drastic measures.