Countless numbers of Catholics used private revelations as beacons of hope only to have that hope crushed when things never materialized. Heck, hard to wave the Fatima flag when after almost a hundred years folks are still making excuses why things have occurred as they have (and are). Hard to explain why 8 popes and thousands of bishops and cardinals have ignored Our Lady's request. Seems like +Williamson is not the only one who has made a few errors regarding private revelations. That doesn't mean he is not a good bishop.
Which reminds me, there are plenty of internet accounts of St. Padre Pio telling pilgrims to go to Garabandal. Perhaps St. Padre Pio isn't all we thought he was cracked up to be (sarcasm).