why just feet?
"the feet become disarticulated from the body naturally with time, as the bodies decompose and are eaten by sea life or other marine organisms...the material in the running shoes or hiking boots is too tough for anything to eat through, and some of them have air in them or rubber soles that cause them to float"
"the Strait of Juan de Fuca, the Strait of Georgia and Puget Sound off northern Washington and southern British Columbia - appears to be uniquely suited for such discoveries because of circular currents that carry debris through the intricate coastal waterways, she said.“All of the feet have been found within about 125 miles of one another,” she noted."
why mostly left feet?
no one knows. chance i suppose. it just ain't right but it is probably because that is the only foot left...