In short, just to make sure you understand why you should share the road with cyclists: It's the law. If you will take the time to study this, you will see that, in June 2008, South Carolina Gov. Mark Sanford signed into law protections for cyclists from idiot motorists.
The contents of Ms. Guarnieri's letter sounds as if she is laying down a threat that she will not share the road and will actually go out of her way to be abusive to cyclists. I would warn her not to take this stance, because cyclists like myself know what our rights are, and we are prepared to report abuse. She should be aware that the fines are extreme.
Beyond that, let me ask this: Will a motorist be able to live with himself if, through his hate and ignorance, he actually struck a cyclist? If he ran me down and left me lying in a ditch, will he feel vindicated thinking it's his right and duty to remove me from the road? Do motorists plan to keep score of how many they can mow down?
Whatever is the source of the letter writer's hatred needs to be treated immediately, and I would suggest that she might want to consider some type of public transportation until she has her urges under control.
North Augusta, S.C.