I once had a dear friend who sold all he had during the year of 1999 (doomsday was coming on Jan 1, 2000, remember), moved his family, and invested hundreds of thousands of dollars on emergency contingencies ( he had a power plant installed in the basement of his new home in the country that would light a small city!)...when Jan 1, 2000 arrived, with no sign of 'the end', he never addressed the issue of being 'wrong.' He had influence over a wide range of my friends who were in varying degrees of fear as 'the day approached'...and when the 'day' passed, he never apologized nor ever addressed this issue again.
Wonder if Harold Camping will do the same or will he fess up and apologize for the errors of his way and realize his paranoia is infectious.