There are a lot of assumptions being made about what was or was not behind the behavior of the others on the MUP. Could be that some of them are correct, or it could be that they are dead wrong. I Wonder what was really going on? My experience has been that in recreational settings when riders are three abreast, they're usually talking up a storm. If they're on a path that rarely gets ten people, I could see where there was little expectation they'd run into other riders. These might be very decent people who care more about others than some of you imagine. Or, they could be thoughtless, I only care about me, people too. Like I said, I wonder what was really going on?