Yeah, I cried. That is so true. When I was a teen I worked at our vet's office. He was also sort of the local Animal Shelter. I remember people bringing in animals because they were "too busy", "don't have time" you name it. Most often the animal would be killed. To the vet's credit he would put the animal to sleep before the lethal injection. He cried too. But unfortunately that is the exception to the rule. My daughter worked in one of the 'killing houses' (my term) down here and they are killed as a matter of course. She would come home crying and angry because of the lack of care, both physical and emotional the animals were getting.
If only idiot humans would THINK before they get that cute puppy or kitty.