Nobody wanted to talk in 1947 after witnessing the notorious UFO crash in Roswell, New Mexico. Intimidation by the U.S. government effectively shut them up. The U.S. insisted at first it was only a weather balloon, then claimed secrecy was required as a matter of national security.
But now, as the witnesses reach old age and near death, they open up and tell the truth to the world, from their deathbeds, with the last air they breathe. According to law, deathbed confessions must be considered true, and it's hard not to believe these.