I once thought I could never, ever Kill one of my chickens - or any other animal, for that matter. Then I had an injured bird and there was nobody about but me to put her out of her misery. It was hard, and I cried...
Fast forward a few months and, while killing will never be easy, I have a different view on it now. I believe I'd rather eat meat that I know came from a well treated, free ranged, happy bird than from some poor creature that lived its short life stuffed in a small wire cage with 4 other unhappy birds - never to have the sun shine on its back.
Oddly enough, over these past few months, that very philosophy has led me to want to raise my own meat birds, knowing that I could raise them well and give them a humane death.
My biggest girl, "Tanker."

(Going through a molt and with NuStock all over her legs - hopefully I can get some prettier pictures in the next month or so.)
Normally I would never name a meat bird, but this one will be kept around for a while, I think. Just since bringing them home on Saturday, the 4 girls have given me 4 eggs (that I know of - - as they tend to bury them in the hay - LOL). The plan is that the best quality offspring will be kept and bred, while the lesser-quality birds will live good lives and then feed my family.
No - culling is never easy, but giving them a happy, healthy life is! It took me over 40 years to get to this point, and each and every one of us will have different approaches to the whole life/death philosophy. Do what is right for you, and the rest of us will support your choices.