I reproduce this official statement from the Vatican Information Service. As far as I am concerned, Pope Francis is innocent of any collaboration with an evil dictatorship, and I will not comment any further on the issue.
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RESPONSE TO ACCUSATIONS AGAINST BERGOGLIO IN ARGENTINA
Vatican City, 15 March 2013 (VIS) – At this afternoon’s press conference, Fr. Federico Lombardi, S.J., director of the Holy See Press Office read a statement responding to allegations made against Bergoglio in Argentina. It states:
“The campaign against Bergoglio is well-known and dates back to many years ago. It has been made by a publication that carries out sometimes slanderous and defamatory campaigns. The anticlerical cast of this campaign and of other accusations against Bergoglio is well-known and obvious.”
“The charges refer to the time before Jorge Mario Bergoglio became bishop [of Buenos Aires], when he was Provincial Superior of the Jesuits in Argentina and accuse him of not having protected two priests who were kidnapped.”
“This was never a concrete or credible accusation in his regard. He was questioned by an Argentinian court as someone aware of the situation but never as a defendant. He has, in documented form, denied any accusations.”
“Instead, there have been many declarations demonstrating how much Bergoglio did to protect many persons at the time of the military dictatorship. Bergoglio’s role, once he became bishop, in promoting a request for forgiveness of the Church in Argentina for not having done enough at the time of the dictatorship is also well-known.”
“The accusations pertain to a use of historical-sociological analysis of the dictatorship period made years ago by anticlerical elements to attack the Church. They must be firmly rejected.”

It seems to me that the usual criticism (see also Pius XII) is ‘didn’t do enough’. Just what would ‘enough’ have been? And would (or could) the critics have done more? Damned if you do, damned if you don’t–some people will never be happy.
I’m sorry – I answered you with Patricius’ comment in mind.
It was the same thing with Pius XII and the Nazis (I am convinced that Pius XII was innocent). The longer I live, the more I can see the subjectivity of history. History becomes what we read into it.