Yep, people have tight schedules dictated usually by their jobs and it is the schedule, not fear, that normally determines duration of stay.
Whether a person wishes to learn bears little on the experience of life; the school of hard knocks has few graduates. Perhaps the difference in our views is in my assessment of the overall benefit derived from personal exposure to differing cultures versus your view that seems to focus on the limits of human compassion and understanding. If a person remains sequestered culturally, they will remain myopic. Only by exposure to foreign elements, no matter "their wish to learn", will there be opportunity to see farther.
Right now, that's an apt description of my world, but I trust I'll weather the funk and be back to waiting by the phone for a call from Hallmark.