Many fly fishermen practice ‘catch and release’ fishing. Most of them kill a fish or two every now and then.
A decade ago I thought a lot about this question.
Here is my conclusion:
1. The fish in your hand: it is better to release than to kill.
2. The fish in your hand: it would have been better not to fish at all.
So I almost stopped fishing. But instead I decided to stop thinking.
It is -9 ºF / -23 ºC.