Not to disparage anything you're saying, but (and this is really addressed to the conversation as a whole) isn't this fairly obvious? Ukemi is a learned skill, it's not something everybody does automatically. Why would we expect J. Random Person to go with the technique? They don't know how.
I beg to differ. Everybody knows (or should know) that Chuck Norris can walk that path automatically, while repeatedly roundhousekicking you in the face.