The church can “claim credit” for what its member do if what they did was done as part of their work in the church with its encouragement and approval.
I am sure there were priests in Rwanda who acted nobly and honorably during the killings. Those few priests who acted badly were not acting as priests.
By the way, Rwandans are devout Catholics for the most part.
I have known several of them and heard their stories.
Local churches did play a role in setting up the catastrophe.
Liberation theology (liberation from our oppressors!) is part of a theological running subtext within Catholicism. It may be much subdued in North America (morphing into other sympathy forms) but elsewhere is a different story.
Last time around, RC Cardinals elected a South American Jesuit to be 'Pope" too.