How Come No One Knows About This?

Seriously?

NOBODY who is old enough to remember that crash would ever forget about it.

People born after, maybe, but nobody who was alive then and old enough to know what was going on could ever forget that disaster.
My Mom was a nurse, and was asked to go to the crash site to assist. She didn't because we had plans to go out of town that day. She talked to a co-worker the following Monday and all they essentially did was dig for bodies.