Referring to the OP, one scenario might be a necessity and warranted, the other isn't. While I am sure there are times when someone somewhere with the proper gear and skills to use it might be more inclined to shoot out past 800+ yards on a critter, the question in my mind, would have to be, is it necessary to begin with. On the other hand reaching out to longer ranges in a case where it can save lives, is completely rationalized in my mind, and the further the better.
There are areas of the country, where putting a stalk on one or more animals is not going to happen, and areas where seeing something even to 50 yards is a slight proposition due to the cover. It comes down to the person who is doing the hunting as to the ethical restraints they impose upon themselves.
To me having someone who doesn't know me, my situation, skills or beliefs, tell me I'm not "ethical" simply because I don't do something the way they think I should, makes about as much since as California banning the way a plastic gas can spout can be made there, and it effecting me being able to purchase one here in Texas that has worked fine for over a decade. Or being told that lead bullets are hazardous to use.
While I DO freely admit, reaching out beyond 500yds is not something for everyone, there are quite a few who can and do shoot quite well enough to make one shot kills at this range and beyond. They have put in the time, effort, and cash to build the skills, load, and rifle package capable of the energy and accuracy to do so. I do not hold anything what so ever against these folks and they are just as free to do as they please as the fellow who just bought a 30-30 to hunt in his back 40.
Myself, I have been there with the long range rifle, and after a year of honest work with it, I managed to dial it in to a 9" group at 1175yds. This said, the longest shot I have made with it on anything other than paper or steel has been just shy of 500yds. Not because I didn't have the skill to do so, I just never have had the chance when the opportunity presented it's self. I don't specifically set up just for a shot like that, and I also feel like most if I can easily get closer I will.
In my lifetime of hunting, some 40+ years, I have tracked plenty of deer and other critters which were shot by myself and other good hunters at ranges less than 100yds. These were mostly all good shots, and the deer were mostly hit solidly. Some were found after a bit of tracking, some weren't found until later, or not at all. I have also had deer at 20yds or less duck when the arrow was released only to hit them high or have them turn and shoot through them length wise with a bow. So the argument about them moving at range verses up close resulting in a bad hit is simply BS. They can and do move at either, so if that is the only argument you might as well quite hunting all together. Two deer in the last 10 years, one with a rifle, one with a bow, I have shot under 40yds were lost initially but found after the yotes and spoilage had occurred. Both were hit solid through the lungs and neither left more than a couple of drops of blood in the hundred or more yards they ran. The cover was simply too dense to follow exactly where they ran, but in both cases we were within several yards of find them both.
Myself, I strive for the utmost accuracy from myself and all of my hunting rigs, be it bow, rifle, or handgun. While many feel pie plate accuracy is plenty good for hunting, I look for, and work for quarter sized or better groups from them all. Every year I watch plenty of folks sight in at 100yds and to me some of their groups, are far from what I would call a group, but they are happily patting themselves on the back and saying that's minute of deer any day. Some of these same folks will argue all day long about shooting past 200yds being unethical and have plenty of "facts" to back them up. Yet all the while do not put in any more time behind the trigger than is necessary to foul the barrel and see that they actually hit the paper. Yet these same folks go out and kill plenty of deer every year, where I may or may not even pull the trigger on one.
All this said, the "ethics' portion of one mans hunt is his business, and while there is a code by which we should all strive to uphold, it simply doesn't apply across the board the same from the thick eastern woods, as it might in the flat mid western plains. There is no getting around the time of flight be it bullet or arrow, or the time between when your brain says to shoot, and your finger actually squeezed the trigger. Some are faster some are slower, but in that brief span of time, things can and do happen no matter the range, and once either is on it's way, there is no way of changing the outcome good or bad. IMO, You either have to live with knowing this and accept the consequences, or simply give it up and move on to some other past time. Either way don't simply judge one another based solely on your abilities or conditions, as they may or may not apply to their circumstance. If they are within the law and doing the best of their ability, that's good enough for me