1) It’s been known since it happened that there were priests who did things like not defend those who sought refuge in churches. It should be noted that there were priests who DID do the right thing and no one ever talks about them.
2) No pope need apologize for the failings of bishops and priests in Rwanda. The pope of the time, John Paul II, did NOT cause the massacre and condemned it. Both perps and victims were largely Catholics by the way.
The local native clergy, many got caught up in the intense ethnic mania.