This explanation seems to me to ignore the process by which a bishop becomes a bishop. While my reading indicated a somewhat complicated process, two key elements were that approval was required by the appropriate congregation of the Roman Curia (Vatican) and that the actual appointment was made directly by the Pope. The Vatican cannot simply install these people and then wash its hands of everything they do or don't do.
The attitude I seem to be getting from apologists is that the Vatican/Pope chooses the bishops (who then choose the priests) but after that all bets are off and the Vatican/Pope then bears no responsibility for what happens later. For example, you said:
That the Pope is ultimately in charge of this matters is half the truth. He mostly works through delegation to bishops who are sovereign in their dioceses. While he can in principle dismiss a bishop, it is a highly unusual thing to do, and we Catholics dont like innovation.
It's not a half truth if the Pope CHOSE the bishop in the first place! :) Of course the Pope is ultimately in charge because he chose the bishop, has FULL authority over him, and the at-will right of removal. Given the scope of the scandal I find the rarity of removal to be damning rather than exculpatory. It gives all the appearance of the Pope not wanting to admit a mistake and doubling-down on a wrong choice made.
good points.
I am simply pointing out that a bishop, once installed, receives a very wide lattitude in how he administers his diocese. In the case of several latently homosexual bishops it proved unfortunate.
Note please, that the strict control from Rome that you correctly say was lacking during John Paul II pontificate is the exact opposite of Protestant ecclesiology, which produced the same rate of abuse but rarely faces the consequences of it.