My point has always been that every person should make their decisions from a strong position of knowledge, knowing full well the consequences if they do not cull a bird who is a carrier of a disease that will likely end up infecting others in their flock or someone else's flock in the future.
That is all I ask, all I've ever asked-for the owners to not put their fingers in their ears and cover their eyes so they remain blissfully ignorant of some of the harsh realities of chicken keeping. They must realize that chickens are avians, not mammals, and therefore, must be treated differently.
If you decide to treat, know what you're up against and what precautions you must always follow if you decide to keep a perpetually sick bird in your flock. You have to face that in order to make an informed decision.
Soft hearted? I'm guilty of that. I had hen in a cage, a hen who was over 5 years old, raised from a day old chick, ready to put her down, when I decided to consult the state vet to make sure what I was dealing with. He informed me that she had a bacterial sinus infection, secondary to a fungal infection she suffered from last summer, along with my rooster and a couple of older hens, caused by the circumstances of the protracted heat/humidity that they were not used to here. He said he was 100% certain that she was not contagious, that if she had lived to her age with no illness, she was highly resistant and complimented us on raising such healthy birds. So, I was ready to cull this bird we loved and would have done it through tears. Yes, we are soft hearted, but realists, too.