If I had to guess I would have to say that 99% of the time that is exactly the case. I know that 100% of the incidents I have seen were the fault of the person that got hit.
I know that there is a lot of distraction in a place like WDW, but, seriously if you are hit, you are the one that is going to feel the physical pain. PAY ATTENTION TO WHERE YOU ARE AS OPPOSED TO EVERYTHING AROUND YOU! I have made 43 trips to WDW over a span of 31 years and have never been hit but a stroller or an
ECV. I have seen posts from people that say that they have been hit multiple times. Guess what? They are the common denominator in this little story.
I do know that due to a temporary injury, I had to use a
ECV in a public event. I can tell you that people, if they see you decide that they should be able to go ahead of you or if they stop quick and they are accidentally hit by one, guess who they blame. The time I used it I had quite the enlightenment concerning them. The first is that they don't have mechanical brakes. They stop by releasing the acceleration button. In a panic moment ones natural instinct is to hold it on even harder. When you do release it, there is a second or two time delay until the machine will stop moving forward and the engine brake takes over to lock it in place. Not to mention the fact that you have to spend the entire time face high to everyone's butt.
Moral of the story... Stop being an idiot and pay attention. And second, if an accident should happen, you are probably to blame for it. At least allow the benefit of the doubt and not make the actual "victim" feel guilty for something that the chances are were caused by you to begin with.