You want to talk trapping? GREAT! Let's dance!
First off.....this talk of animals chewing off their limbs and lingering for many hours. I know PETA and the like try to paint that as the norm, but that's about as accurate as their claim that for every RECOVERED bow shot deer, there are 4 or 5 that wander off and die lingering deaths. That's kind of thing is the mark of inexperience in a trapper. Here's why. The whole point of trapping is to get the animals pelt. You want that pelt in as perfect a condition as possible so that you can get the most money for it. To do that you want that animal to spend as little time in a trap alive as possible so that all damage is minimized. You also speak of tearing off limbs. The only time that can happen is if the animal is alive, and you in your inexperience have set a trap for the particular animal you are setting for that is TOO BIG for it and you break bone. When you trap aquatic furbearers, you rig either "killer" type traps (Conibears), or you make drowning sets. That's what I did for my muskrat, beaver and mink sets. In all the years I trapped, I had ONE pull out, and that was when I first started. After that my mentor showed me how to make drowning sets. For land based animals, you DO NOT stake a trap, but you use brush grapples so that the animal cannot get a firm pull. They do not go far.
When trapping certain animals you also use a trap size specifically for a front or rear foot. This is quite common when trapping beaver. You have to know how to analyze beaver "slides" where they enter and leave the water. For land animals, you need to be able to target exactly where an animal will set a foot based on body size so that you catch the animal you are pursuing. An example of this is if you want coyotes, and not possums.
As far as a camera in this application goes, all it would do is tell you when you had an animal, and it would be a moot point for me, because the cost of a camera that could be monitored from home would make the entire venture cost prohibitive, and for me the whole point of trapping in the first place was the daily (and sometimes twice daily) walk I made in the woods and fields. The so-called "lessening of time suffering" wouldn't change. Any ethical and smart trapper checks his traps ASAP for the reasons I already pointed out. Drowning and killer traps take that part out of the equation, but you still want to recover the animal quick to lessen pelt damage by other predators.
I know you are trying to "catch" me in a "whats' the difference" analogy, but the camera angle ain't it. But being the benevolet fellow that I am (remember, no right or wrong answers, just honest ones), I will tell you how you can. If I were really wanting NO "high tech" (which again is a realtive term and will vary with each person, or as JPH says...quite accurately I may add.....is a "moving target") as far as trapping goes, then I'd NOT be using mass produced steel traps. I'd be using deadfalls and other type set ups that used all natural materials that I found in the woods. But I don't. Lastly, for me anyway, setting up a camera is no comparison to the skills and woodsmanship one needs to trap. If you have any woods skills at all then figuring out where to point a camera in the hopes of taking a picture of a deer shouldn't be all that difficult, while with the trap you have to know what is there, and specifically to the square inch of where you want it to put it's foot.
As a final point...be VERY careful with this kind of analogy....
"I would have to ask what is the difference between setting out a leg trap over night or putting a camera up over night? Your still haveing to #1 scout a place to set the camera just like a leg trap #2 put it out like a leg trap #3 check it like a leg trap. But one thing that does come to mind is you don't run the chance with a trail cam of lameing a animal that dosn't deserve to be in a leg trap."
Why? Because that very thing can be said for hunting. Why attempt to shoot the deer and risk wounding and not recovering it when you can just take a harmless photo of it?
These are my answers to your questions. You may not agree with them, and that's fine. But that's where I'm at.....for me, not you or anyone else.
Offer No Apologies.....
NRA Endowment Life Member