Abandoned dog, how can anyone be so cruel?

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My roommate and I took his dog for a walk to the park last night, and while there, we made, well, his dog made, a discovery. She was running off leash and spotted a dog in the brush by the hill. She wasn't barking at him like she usually does with other dogs, so we knew something was wrong. As we got closer, we knew for sure that it was another dog, and that there was something wrong with him as he was stumbling around in the thick grass. I called my other roommate after a failed attempt to contact TAS, and he came over with the car, and we took this poor dog home. Someone had abandoned this dog, he was weak, frail and malnourished. He was muddy, wet and matted severely. He'd clearly been out for a while. When we brought him home, he lay down in the kitchen, shivering, but finally warm and able to dry off. He couldn't stand for long periods of time, and was peeing constantly all over the floors. I tried making more calls, but there was no one open that time of night, so I had to wait until this morning. The poor dog was dehydrated. But he felt safe here, I think he slept less than I did, and I only slept a few hours, continually waking when he moved around or peed again. I called TAS around 9am, and they got here quickly to pick the dog up. The driver put the dog on a rolling stretcher and wheeled him out the door to the truck. I will be calling later to find out if they had to put him down, I really hope they don't have to. I'm hoping for the best but expecting to hear the worst in this case. This dog felt love though, that's what he needed. He craved human contact so much that he'd try to follow me if I went outside or to the bathroom. He didn't want to be alone. He's an old dog, and I hope that he has a chance to recover and find a home to live out his remaining years. It's not fair that someone would just abandon their dog in a time of need, to toss him out like he's trash. People like that don't deserve to have a pet, they never do. I'm shattered that I had to find this dog the way I did, but if we hadn't gone out last night when we did, he would have died out in the rain, without anyone knowing he was there.