You wouldn't know if you're outside the bus and they are in the bus why someone may not move from the seat. I *think* your earlier comment, because you said you didn't care if it was invisible disabilities or not if someone didn't move they were a jerk, was just a response out of annoyance to other people commenting on the thread which is why I tried multiple times to essentially excuse away your more harsher words towards other people rather than taking them at face value that that was how you really viewed people but at the same token that's also why I kept saying how people can be with a Disney, it helps me at least if I assume people are in the same cranky tired disposition as me when I'm done with Disney for the day.
The seats are there for a reason most people get that. What makes this situation tricky, as I mentioned, was that you showed up after the bus is loading hence why I asked some follow up questions to help me understand and why it may help you understand for the future what Disney advises is the process when that happens if you contacted them rather than setting the expectation in your mind that they will just do what you think (by any means here) should do.