>>Another approach is a simple letter to the editor alerting people to the lie. <<
Totally useless. In all probability, it won’t get published. If it does, it will be so butchered, you won’t recognize your own writing.
Wilmington (DE) News Journal has a history of left-wing bias. Personally, I have had several letters “lost” AFTER they had confirmed that I had written the letter; several others have been edited because of my viewpoints on abortion (against), politics (Conservative), etc. and I had one letter published - with TWO rebuttals!