Righteous indignation can cause us to be so abrasive, so forceful, so offensive that we only antagonize the very people we want to communicate with. Consider the prophet Nathan who confronted King David in 2 Samuel 12 after his adultery with Bethsheba and the murder of her husband Uriah. Nathan didn't confront David directly about his sin, he told a story that inflamed David's own anger at injustice, then Nathan confronts David about his sin. With this approach Nathan bypassed David's defenses and brought David to repentance and restoration as a man of God. Righteous indignation is a necessary part of being moral creatures, but it also puts us in danger of being condescending and judgmental so that by our actions we merely drive people deeper into doing wrong instead of bringing them to freedom, restoration, and righteousness.
Ordinary people get letters to the editor published every day.
The newspaper opinion page is intended to be a public form. It should have a variety of opposing opinions. Even one sided bias newspapers will publish letters which oppose their editorial position. It helps sell newspapers to have some controversy. As Christians we are concerned about moral ethical issues in society and the eternal consequences of unrighteousness.