Is the CDC or WHO recommending that people stay off of beaches? Is the incidence of coronavirus significantly different in the vacation spots from where the vacationers are coming from?
It is, in fact, possible to overreact to a disease. A heck of a lot of people in the world today are doing so. The people saying to take every conceivable precaution, just in case, are making thing worse, not better. Do not assume that, just because someone is reacting to a lesser degree than you are, that they are doing something wrong or unwise.