It would seem that presumptive arrogance of ecclesial position prompted Card. Muller to respond in writing to Ms Collins' letter. Actually, it is fortuitous that he did. It is a glaring example, a teaching moment, of the kind of clericalism that would prompt a sexually abusive priest to deny with impudence.  It is also a glaring example and teaching moment, as well, of the Bishop who would deny sexual abuse, facilitate its continuation by denial, obfuscation and further demeaning the victim(s). 
The presumption that "sacred trust" of ordination and "elevated position" are sufficient to carry a lie over the sad truth of an "abused person" of no apparent leverage is at the core of a clericalism that infects the uber-traditionalist catholic, the seminarian, the priest, bishop, cardinal and even some popes.  It is a prime example of systematic and systemic abuse.
Thank you Ms.Collins. An ironic thanks to Card Muller- you caught yourself.