Fishing is a blood sport, plain and simple. Live release fishing is
supposed to be a, shall we say,
more or less bloodless offshoot, but of course it doesn't always work out that way. Some fish are gonna die; it's that simple. You are 100% correct; if one can't face that reality, one had better not start fishing.
But using all those extreme examples and equating them to frisbee-tossing a hapless sunfish is really a reach. The fact that a guy in the Pacific is hooking a Marlin that swims like a freight-train and spends most of its time airborne...in no way justifies, IMHO, tossing a Rock Bass like a dog-fetch toy.
"Yes, officer, I was doing 70 in a 50 zone...but there are guys right now at Indianapolis doing laps at 200! It's the same thing!" No...no, it isn't.
That's what the point of this thread was: opinions. It's not grandstanding to express a different opinion, and to attempt to explain the difference.
I'm not a bleeding-heart, IMHO...I eat meat that I get by killing animals, including fish. I do it myself, rather than paying an unknown slaughterhouse worker to do the deed for me. I am not squeamish. But, at the same time...I try to avoid the use of live bait, simply because I don't enjoy putting a hook through a fish. I won't use frogs at all, simply because...I like frogs.

Worms and leeches are, hypocritically, still on the table. Anyone who does use live bait is probably aware of all the myriad subtleties of how to put it on the hook, with an eye towards maximizing the time it remains live and active and attractive to predators. So, yeah...this is, by definition...torture...IMHO.
I don't use ultralight tackle, either; I am going for the heaviest tackle that still allows the placement of a lure or bait effectively, and does not scare off my quarry, while still allowing me to land it a bit "green"...rather than fighting it to utter near-death exhaustion, as in the old days, and as mentioned by
Trouser Cough
. I want the thing to live, so I don't want to fight it to death...IMHO...
We can carry the analogy over into the aquarium hobby very easily. If I have a fish that requires "euthanization"...I use either my thumb, a brick or an icepick, depending upon the size of the critter...and IMHO the result is far more humane than what is accomplished by those sensitive types who insist on clove oil or other concoctions, and then spend hours on the internet discussing the best way to "euthanize" a creature an inch long. Oh, and if a fish dies in my tank...that's what it does, it dies. It doesn't "pass on" or "go to swim under the Rainbow Bridge" (yeah, I've read that on another forum...) or any other silly s**t. It dies, and we should own up to that and not sugar-coat it...IMHO.
That's what this thread is about:
opinions. Expressing one shouldn't be taken as an indictment of another...IMHO.