Consider the newspaper; it is a disseminator of news, a bringer of tidings - and it bears no political burden. Non-partisan and impartial, its journalists work to inform the reader of the state of the community, the nation and the world. Global catastrophes, school galas, and everything in-between is reported on and written about as truthfully as sources allow.
The only time a written work is allowed to lean in any political direction is when it is an opinion piece - like an editorial or a column.
The editorial is the writer's version of a letter to the editor. In it he or she can express their personal views on any subject. It is the only forum they have in which to do so because general news rightfully favours no particular bias; it should bear no slant and, in the case of this newspaper, it complies strictly with that rule. Anyone who thinks otherwise should provide proof beyond a general accusation. But people believe what suits them. "The Chronicle won't print/is censoring my letters; therefore it's obviously left/right and accommodating my political opposition to my detriment."
The left claims the bias is to the right; the right claims the bias is to the left. While that might make for an interesting game of bowls, such claims are confusing to the reader and irritating to the editor. And blatantly untrue.
Sometimes a letter does not make it to the page and always for good reason. It could be defamatory, libellous or too untrue to publish. It could also be badly written and hard to understand or just a bit too silly to print. Letters are published at the discretion of the editor and, in spite of the opinion of some; he does know what he's doing. After all, he allowed me to write this.