He knowingly protected child molesters, that is beyond doubt.
Did he? Last thing I heard was that there was some kind of power struggle, and that the Pope actually had very little to say in what happened.
Besides, several cases are more than a 30 years old, and most actually predate his papacy.
In fact, from what I can make up from wikipedia* is that he actually tried and partially succeeded to combat the problems more effectively, compared to his predecessors**
So, as far as I can see it, he was better than the rest of the system, which wasn't really that hard.
*Most truthfull source in the world
**The previous methods being that everyone just takes care of his own problems, and hence nothing happened.
Prior to 2001, the primary responsibility for investigating allegations of sexual abuse and disciplining perpetrators rested with the individual dioceses. In 2001, Ratzinger convinced John Paul II to put the Congregation for the Doctrine of the Faith in charge of all investigations and policies surrounding sexual abuse in order to combat such abuse more efficiently.[147][148] According to John L. Allen, Jr., Ratzinger in the following years "acquired a familiarity with the contours of the problem that virtually no other figure in the Catholic Church can claim" and "driven by that encounter with what he would later refer to as 'filth' in the Church, Ratzinger seems to have undergone something of a 'conversion experience' throughout 2003–04. From that point forward, he and his staff seemed driven by a convert's zeal to clean up the mess".[149] In his role as Head of the CDF, he "led important changes made in Church law: the inclusion in canon law of internet offences against children, the extension of child abuse offences to include the sexual abuse of all under 18, the case by case waiving of the statute of limitation and the establishment of a fast-track dismissal from the clerical state for offenders."[150] As the Head of the CDF, Ratzinger developed a reputation for handling these cases. According to Charles J. Scicluna, a former prosecutor handling sexual abuse cases, "Cardinal Ratzinger displayed great wisdom and firmness in handling those cases, also demonstrating great courage in facing some of the most difficult and thorny cases, sine acceptione personarum (without exceptions)".[149][151]
One of the cases Ratzinger pursued involved Father Marcial Maciel Degollado, a Mexican priest and founder of the Legion of Christ, who had been accused repeatedly of sexual abuse. Biographer Andrea Tornielli suggested that Cardinal Ratzinger had wanted to take action against Marcial Maciel Degollado, but that John Paul II and other high-ranking officials, including several cardinals and notably the pope's influential secretary Stanisław Dziwisz, prevented him from doing so.[148][152] According to Jason Berry, Angelo Sodano "pressured" Cardinal Ratzinger, who was "operating on the assumption that the charges were not justified", to halt the proceedings against Maciel in 1999[153] When Maciel was honored by the Pope in 2004, new accusers came forward[153] and Cardinal Ratzinger "took it on himself to authorize an investigation of Maciel"[148] After Ratzinger became pope he began proceedings against Maciel and the Legion of Christ that forced Maciel out of active service in the Church.[147] On 1 May 2010 the Vatican issued a statement denouncing Maciel's "very serious and objectively immoral acts", which were "confirmed by incontrovertible testimonies" and represent "true crimes and manifest a life without scruples or authentic religious sentiment." Pope Benedict also said he would appoint a special commission to examine the Legionaries’ constitution and open an investigation into its lay affiliate Regnum Christi.[154] Cardinal Christoph Schönborn explained that Ratzinger "made entirely clear efforts not to cover things up but to tackle and investigate them. This was not always met with approval in the Vatican".[147][155] According to Schönborn, Cardinal Ratzinger had pressed John Paul II to investigate Hans Hermann Groër, an Austrian cardinal and friend of John Paul accused of sexual abuse, resulting in Groër's resignation.[152]
In March 2010, the Pope sent a Pastoral Letter to the Catholic Church in Ireland addressing cases of sexual abuse by Catholic priests to minors, expressing sorrow, and promising changes in the way accusations of abuse are dealt with.[156] Victim groups claim the letter failed to clarify if secular law enforcement has priority over canon law confidentiality pertaining to internal investigation of abuse allegations.[157][158][159][160] The Pope then promised to introduce measures that would 'safeguard young people in the future' and 'bring to justice' priests who were responsible for abuse.[146] In April, the Vatican issued guidelines on how existing Church law should be implemented. The guideline dictates that "Civil law concerning reporting of crimes... should always be followed."[161] The guideline was intended to follow the norms established by U.S. bishops, but it does not require the reporting of "allegations" or crimes where reporting is not required by law