The gloom and doom of the likes of Harold Camping is nothing new, as John XXIII advised.
“In the daily exercise of our pastoral office, sometimes (much to our regret) we have to listen to people who … can see nothing but calamities and ruin in these modern times. Comparing our era with previous centuries, they say that we are becoming worse. By their actions they show that they have learned nothing from history, which is the teacher of life …. We feel that we must disagree with these prophets of gloom who are always forecasting disaster, as if the end of the world were imminent. In the present day, Divine Providence is leading us to a new order of human relations. By man’s own efforts, and beyond the gareatest expectation, we are being directed towards the fulfillment of God’s higher and inscrutable designs.”
Pope John XXIII, Opening address, Vatican II, 11 October 1962.
I’ve read that John XXIII may have been referring to the claimed apocalyptic prophecies said to have been in the third Fatima secret, which he would have read; claimed prophecies the Vatican now says do not exist.