Isolated Incident

Isolated Incident (noun)
 * 1) when people say a so-called trend is occuring because they want to make a sweeping over-generalization about another group of people just because something happened that seems so much like the other times that something similar happened, but none of the times these things happened are related because they are so very, very different, so there is no trend making the person who said it look like the alarmist that they are

Examples:
 * when an African-American male is pulled over because he matches the description of a suspect the police are looking for
 * when an African-American suspect is arrested because when he was pulled over for matching the description of a fugitive the police were looking for he "acted up"
 * when an African-American convict receives the maximum allowable sentence because he has a very long record
 * when an African-American ex-prisoner is pulled over because he matches the description of a suspect the police are looking for