Following a court order, the church posted on its website tens of thousands of pages of the previously secret personnel files of 122 priests accused of molesting children.
In his letter, Gomez described the latest records to be made public as "brutal and painful reading."
"The behavior described in these files is terribly sad and evil," Gomez wrote. "There is no excuse, no explaining away what happened to these children. The priests involved had the duty to be their spiritual fathers and they failed."
Outside Our Lady of the Angels Cathedral in downtown Los Angeles, Donald L. Kohles stood with a picket sign reading "Phony Mahony."
Kohles, who described himself as a devout Catholic, told the Times that "The church needs to be purified."