I say that it being a little injured is worth it if the owner stops feeding it poor little mice...But I still feel bad for the snake.

Of course I'm obviously biased, but when it comes to rodents, especially rats, I hate it when they are fed live. Of course, it's not my choice because I don't have a snake, it's just my honest opinion.

When my best friend (koneko_kokoro) had a creamsicle corn snake, she fed it frozen pinkies, but they snake wouldn't eat it. So then she resorted to crickets and small portions of table scraps. Not sure if that is healthy, but I'd say probably more humane...