I believe Oscar Romero is a saint and was martyred for his faith, in upholding Church teaching about the rights and dignity of each human person, in a society where these were denied the poor, quite aside from political considerations.
Just to get that out of the way....
But is everyone who speaks against a saint's cause presumed to be acting in bad faith?
Don't you imagine there were people who hadn't had any contact with St Augustine after his youth, and when they heard his hagiographers thought, "Gus? [or maybe, Augie,] that dog??!?!? that drunken whoremonger?????
Go back further, don't you think there were probably Christians who died thinking of St Paul as "that son of a *****"? (And I don't just mean St Stephen.....)
We know that Pope Francis thinks gossip is the worst of all possible sins, and I suppose he knows some of the actual parties involved, but isn't it possible that Romero's "own brothers in the priesthood and the episcopate," weren't attacking him even after his death by "the hardest stone that exists in the world: the tongue" but giving their honest opinions?
Surely in the causes of the Martyrs of the Spanish Civil War there were also voices on both sides of the question, and sincere voices at that -- because someone thinks fascism a greater danger than communism, or vice versa, and sees matters from a different POV than that of those whose views prevail is no reason to calumniate them.
The Holy Father seems very comfortable in assigning malevolent motives to members of the episcopate who disagree with him, e.g. "closed hearts which frequently hide behind the Church’s teachings", people who "sit in the chair of Moses and judge" displaying "superiority and superficiality," those who express themselves "not in entirely well-meaning ways."
The automatic assumption that those who oppose you are acting in bad faith is destroying the civic fabric of the US, I think we need to guard against it in the Church.