The point of the question is to see how you deal with your own choices. It’s easy (in a morbid way) as there are no good or bad choices, only the question is which outcome bothers the decision maker more. As crashanddie says, reality says most people will not react, but that does not imply it is the correct or moral way to do it.

A closely related dilemma that actually DOES happen (and to which people are being prepared to/talked about), is the case where the doctor(s) have to make a choice, for example with a pregnant woman who is heavily injured. The doctor can choose to save the mother, the child, or just be indifferent and do nothing, which will very likely (but not certainly!) result in the death of both. It’s a very sad decision to make and it’s very difficult to say indifference is the ’easy choice’.