If hacker stole your data from lousy credit rating bureau or alike - security questions are not information commonly associated with your SSN. Every merchant/s

If hacker stole your data from lousy credit rating bureau or alike - security questions are not information commonly associated with your SSN. Every merchant/sevice in this case keep their own "last line of defense" - your security Q/A's. While being PITA sometime - they are offering a way to steer hacker away from you to easier targets. You don't know how many times some bad guy failed to answer your security question and moved on. But this does happen often.