Hmm its one of these questions that u never think unless asked...
...the answer would be different for every person.
I would say (from a strictly secular point of view) because:
a) we are self aware and know that killing is a permanent change. This has given us a feeling of the vast importance of life.
b) we usually do not desire to be killed and we agree that 'to not kill' is a decent price to pay for 'not be killed'. In simpler words we as individuals probably feel that we have better chances in a society that killing is illegal.
c) frankly, we are too good at it. You dont become the dominant species on earth unless you are a very efficient killer. We are one of the few animals that kill for fun. A Taboo on murder is therefore a way to prevent self destruction.
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