In Australia, there is currently a
Royal Commission into Institutional Responses to Child Abuse.
Their findings so far have indicated that EVERY institution that dealt with children during the period under investigation abused them and handled that abuse in the same way, all of them, religious and government alike. It was/is not a problem exclusive to Catholics.
They disbelieved the children who were abused even in the face of overwhelming medical evidence, moved the offenders around, and covered it up.
3.4
VICTIMS
All children in an institution, who have an association with an institution or in out-of-home care may be at risk of sexual abuse. We are learning which children are most vulnerable, and what factors increase that vulnerability.
Some children are more vulnerable because of their age, ethnicity, gender, disability or immigration status. Others are vulnerable because of where they are living or being cared for. The risks of abuse can increase with geographical isolation, where there are no trusted adults to approach, or where there is inadequate training and staff supervision.
Links to case study reports for more information:
Findings
Pedophiles gravitate to positions which place them in authority over children, especially vulnerable children. Since the scandal concerning priests and religious came to light, the Catholic Church has been a lot more stringent about vetting applicants. Most of the stories coming out are around 30 years old so hopefully, they are being successful at weeding abusers out.
I would avoid using a tu quoque argument. Just because Protestant pastors or government officials may have abused children and covered it up, it is no excuse for Catholic priests, monks or laymen to have done so, too.
You can point out that we have taken the scandal on board and are doing something about it, no longer hiding it or allowing and enabling abusers but saying that they did it too does not exonerate us.