I read with interest and increasing alarm the recent letter by Charles Kinkade (“Sunset Cliffs’ Ross Rock not a community easel,” Sept. 10 Beacon, page 6).   I would like to point out a few of the vituperative comments made by Mr. Kinkade:  “Among the parasitic problems in the world … ”  “You should clean up your acne… .”   Mr. Kinkade made some valid and valuable points with regard to honoring our lovely community and the natural environment we are blessed with.  However, I am frightened such a spiteful person lives in close proximity to me.