Very well said:
He said to me “If you see a child drowning in the river, what would you do?” To which I obviously answered I would jump in and try to save the child.
He then asked “What if when you rescue the child you see more children, more than you can possibly rescue, coming from upstream and drowning?”. This frustrated me, obviously I wanted to save all the children but it was impossible - there would be too many.
He then asked “Do you not think it would be better to investigate upstream as to why so many children are falling in to the river in the first place?”