Bishop Thomas Gumbleton was asked to testify because HE was abused by a Catholic priest as a child. Gumbleton IS a Catholic Church sex-abuse victim.
(Gumbleton's brother is gay, I think also abused by same priest - but can't remember for sure, but his brother is gay and so Gumbleton had spoken up early about gay rights, another thorn in the church's side when it comes to Gumbleton).