"Hindsight bias is a close relative of the availability heuristic. You tend to believe anecdotes and individual sensational news stories are more representative of the big picture than they are. If you see lots of shark attacks in the news, you think, “Gosh, sharks are out of control.” What you should think is, “Gosh, the news loves to cover shark attacks."
http://youarenotsosmart.com/2010/06/14/hindsight-bias/IOW, there are two things to notice here. One is that suddenly the news media has taken an interest in covering events that happen with a troublesome frequency. Second, oil spills happen all the time, and no one bothers to say squat about it until property values are in danger.