I'm not sure I know what you are referring to by "such events". Do you mean a person being refused admission to the United States despite holding a valid visa? It happens all the time. It's not rare at all. And there really is nothing in the account of the Rabbi family to suggest they were mistreated. They were given food and drink at the airport and then transferred to a detention facility (where they could get real meals and some sleep) until the next flight on which they could be returned. Sounds fair to me.