Hi Rick. No, you're right, it's not a matter of moving to accommodate someone else. I won't speak for others but in my own post I meant that headphones could prevent me from knowing that someone is right behind me or next to me. I don't move OUT of their way, but I also don't cut over to the water station right then or slow down right in front of them. I would feed bad if I tripped someone because I failed to look over my shoulder.
I agree with your points, and in fact I made a very similar defense in a thread about 6 months ago. (That thread wasn't about headphones, it was about people/kids cutting others off in a race, etc.) I said it's just part of the experience, you can't prevent it, people don't take the same path or run at exactly the same speed, and we have to choose a positive attitude, etc. Some guy chewed me up and said that nobody should ever have to expect another person to get in their way, and it was simply a matter of pointing out their error to them. He said he pointedly approaches people in races and tells them not to do that stuff (Mr. Race Policeman!), and by me not doing the same thing, I was the problem. I don't know what world he lives in, but I'm sure he has lots of friends. 