I don't think anyone on here is suggesting that they personally have a selfish reason to visit Duxford this week, least of all to rubberneck the scene of this tragedy. I certainly don't and, if I lived in East Anglia, I could/would probably reschedule my visit anyway.
However, I don't live in East Anglia; I live in Cumbria. If I'd planned to visit the IWM this week it would have comprised a 600 mile round trip, reservation of at least 2 nights hotel accommodation and scheduling of other domestic arrangements. With the greatest respect for the victim and their family I might have found that closure of the entire Duxford site was a little extreme. Would this not be a fairly localised accident site? Would a fatal RTC on Exhibition Road justify a 2-day closure of the Science Museum?