Although this post has gotten a bit touchy, this seems to sum up the logical view on the topic. The OP seems to have no anger towards pedestrians, but is simply looking for a safe place to ride for everybody. It is up to all of us to keep the roads a safe place. We wouldn't think of walking our dogs in the dark in ninja attire on a well travelled and poorly lit highway. Why should this be acceptable behavior on any other road? Hopefully this pedestrian will take some precautions on future dog-walking expeditions.
Sometimes accidents truly are unavoidable, but we don't need to encourage behavior that increases the likelihood of unfortunate incidents on the road. Okay, so maybe "irresponsible moron" is a bit strong; but if you look at the sun long enough, you're bound to go blind eventually.