When I worked in London near London bridge years ago one of the reasons we had two datacentres (with a whopping 10Mbs link) was they where worried about the Thames flooding our building - that was before the barrier was finished.

With an interesting twist to it. Is it more or less immoral to switch tracks if they’ve already been run over by another trolley? Do we try to minimize the total amount of suffering or maximize the number of people with no suffering? Do you reflood a neighborhood to spare another that hasn’t flooded yet?