Agree. I had a Brahma with fly strike once that, by the time I found her, had sustained pretty heavy blood loss and had lost a monumental amount of flesh. I think there were holes into or nearly into her abdominal cavity and they were starting on her keel area. How she was still alive, I didn't know. Trying to cure her would have been bordering on impossible. In that case, putting her down was the kindest thing I could do.My mindset is: If it's painful but easily curable or not time consuming, I would try to treat. If it's not causing them immense pain, I try to treat. If the bird is suffering, past the point of no return, has a bleak future, or I just don't have the time/energy to take care of it, that's when I personally would do the Deed.
That's only if I could actually do it, mind you. XD
She was a skittish hen, which is why I didn't notice for that long. I still feel bad.