This is a very hard message to get accross to people and even more difficult on a largely American forum where many have the expecation that we can fix things and are relatively new to chicken keeping. I mean no disrespect, but after a few years of struggling to keep a sick chicken alive, only to have it die a few weeks after you think you've dealt with the problem your attitude is likely to change.
I have to admit I have absolutely no experience myself. I only have had chicken for 25 months now and I can't take them to the vet because it's a two hour drive, I don't drive and my partner wouldn't agree to it. I get the impression from internet that in some places in the world (Australia for example) there are more specialized avian vets.I have found that with cats too. If I don't know what is wrong with it neither does the vet
Even if I know you can't cure everything and I'm aware if you keep animals you will necessarily see them die at some point, it's still hard. Maybe you do get used to it when you have lost and euthanized many or at least you make your peace with it.
Last evening I had to remove two hens from him. I did gave him some treat like Perris suggested firstThe advice I got very early on was if you take a rooster out of a tribe for bad behaviour he doesn't go back. It isn't like removing a hen.

Vanille slept in a dog crate and this morning she is so weak I get the feeling it's the end. Then again I have thought she would die at least 20 times and she always made it.
Vanille yesterday
Three days ago
Cannelle, Théo's crush, with the pecks on her comb