I agree this is really awful, but what we don't know, was how was the hurt dog reacting to the person who shot him? I could see him being really docile or really upset about his predicament, I could see myself, trying to calm him, with a soft caring voice and maybe some food or water if I had it, in order to release him, if that did not work, thinking here is a mistake, and this animal is suffering, at least I can stop that. I am assuming the animal was still squirming and trying to extricate himself from that trap, after the shots were fired, and that's why he was found in the trap, instead of being released and left for or thought dead. This is all assumption, and I could hope the shooter might come forth, with the why. I have found suffering animals in the wild and shot them, once I blew a deer tag on a gut shot yearling, because it was the right thing to do. The meat was already ruined, but it was not suffering anymore.