I totally disagree. I view it like a ski slope. The people below you have the right-of-way. On the MUP, then, people in front have the right-of-way over those behind. Yes, joggers (and everyone else) should be cautious at all times, but as you freely admit, warnings are useless when joggers are wearing headphones. Joggers often wear headphones, there's no law against it, so you should be careful and aware of that fact.
I'm not saying the jogger wasn't an idiot, but if I had to allocate blame, it would go to the cyclist (or at least 90% to the cyclist).
I'd say you have the percent backwards. 90% to jogger, and 10% to the cyclist for not being psychic (For shame, by the way.

). If I randomly u-turned in the middle of the street and got nailed by a car, I would accept complete responsibility for being a moron. The accident was almost
completely the joggers fault. Headphones and a blind u-turn? He's lucking Dan reacted so quickly to his idiocy.
Edit: genec, your post cracked me up.