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How would you act? Would you sacrifice the weak to save the strong, or would you take a risk and try to ensure everyone survives?
Let's consider a few situations that I can think of right now.
Situation number one:
You are the leader of a group of people who have ended up on an island (no idea how).
There is very little food. Enough only for a certain number of people. You have a choice:
Give food to the able-bodied people, and simply forget about the old and sick.
Or continue to give food to everyone and simply hope for a miracle.
Situation number two:
Again, you are the leader. Your village/town was destroyed by enemies, and you are leading the people away from the village. After moving a decent distance, you decide to stop and let the people rest. Then, a messenger tells you that the raiders are following your trail, and if you don't abandon the people who are slowing you down, the enemies will soon catch up.
Would you agree to this?
I believe that one shouldn't be a hero. It is, of course, difficult to make the decision to "kill people" in a literal sense, but I think it is necessary to be far-sighted, and it is better for at least some people to survive than for no one to survive.