This is a circular argument to me.
If people are that concerned about the welfare of the fish, just leave them alone, IMO.
Not trying to pick a fight, but this is like a vegetarian who wears leather telling me about cruelty to animals There's no credibility there.
I'm a lifetime hunter and fisherman, and I don't believe in cruelty to animals, and I don't believe in wasting what you kill (not harvest) either.
Having said that, on some level, even C&R fishing is a little cruel.
This is just a sport to us, it is life and death to them.
They should be handled with care, but as I said before, at some point how is it better to catch the fish, stress it, put it through trauma, get your pic, or worse, take it somewhere and weigh it, and then let it go, and you get to feel like a prince for doing it, but a lot of them still die later, especially in summer.
If you do this for very long, whatever your intentions, you will kill some fish. By continuuing to do it at all, you are saying you're OK with the collateral damage.
You are justifying it, as all of us humans do.
My bass fishing is well over 90% C&R, not so much on the panfish, but I do C&R more than I keep even with them.
There is nothing wrong with keeping a few bass within the limits as they are set.
C&R works, but it can be overdone, and it is causing smaller fish in MANY lakes and ponds across the country.
This is well documented.
In fertilized ponds especially, there are recommended take-out per acre rates, this ruins a lot of private ponds, people don't take them out and they overpopulate and become stunted.
As stated, mash the barb or fish moving baits, they don't take them down as deeply.
And again, I'm not trying to start anything here, just throwing some perspective out there. We've all got out opinions and we all justify the things we do, however good or bad they are. It is human nature.