I am not a Catholic, but I find the concerted efforts to smear various Popes to be disgusting and contemptible. In the case of Pope Francis, according to the Vatican, anti-clerical left-wing outlets are trying to accuse him -- without any evidence -- of wrongdoing during the reign of a military junta from 1976-1983.
Left-wingers in the United States responded predictably, with Michael Moore tweeting out a picture later revealed as a hoax, purportedly of Pope Francis offering communion to an Argentine dictator (to his credit, Moore issued a correction).
It should be obvious that the attacks have nothing to do with Pope Francis personally. Rather, they are part of a larger campaign against the Catholic Church, which (notwithstanding its failings) remains as almost the sole remaining, unapologetic exponent of a traditional moral code. There are those on the left who simply cannot tolerate dissent from their own, self-created moral code, and seek to eliminate the Church as a source of moral authority. Undermining this Pope -- any Pope -- is just one part of that effort.
But I suspect Pope Francis will be incredibly effective in repelling such attacks, through the force of his obvious goodness and humility. Accounts of events inside the conclave point out what seem to be his remarkable, genuine humility and obvious love and concern for others -- just what the Church needs now. Smears and criticisms may (read: will) continue, but as Peggy Noonan observed, this Pope seems to be on a mission to rebuild the Church as a true example of Christ's love in the world; people of all faiths of pure heart can only wish him well in that effort.