1. The writer is apparently an equestrian in Oroville, CA and a fairly prolific writer -- likely to be well know in that community. I can envision mailing to other equestrians a copy of her article along with a letter asking if it would be OK to intentionally spook horses if they are slowing us down or if we find their riders to be peculiarly dressed. I can't take the time to do this, but if someone wanted to take the idea and run with it ...
2. She may already be starting to feel the heat -- the article has been taken down from the newspaper's website.
3. Her article is of value to the cycling community because she is putting into words what some other less vocal drivers probably feel -- rage at cyclists who take the lane. We don't have to accept or agree with it, but we'd be wise to know that it occurs and probably more frequently than we'd like to think.
4. I think that from a risk mitigation perspective, we need to understand that when we take the lane to prevent unsafe passing, we also increase the risk that some drivers will become enraged and act upon it, immediately or in the future. We may be in the right from a legal perspective, but I'm addressing the risk equation.