I know this isn't an 'answer', and I believe an earlier poster was trying to make this point, but it seems the question itself has been forgotten (much like "Why isnt the government answering the questions about the other events that happened at 9/11?").
People are so enthralled with their lives that they see a phenomenon and think "Meh, it must have been a fluke.". No one really ever gave an answer that made a lot of sense, and because of society's ability to turn a blind eye and think that someone else will figure it out, the issue was never pushed. Thats not to say that there aren't scientists going ape**** right now trying to figure it out, but the issue to the general public has been forgotten.
Unfortunately this is the reality of it all.