I have personally been no-cull in how I've managed my chickens so far, BUT...it's a luxury to be able to do that. If I had less land, less time, etc, I'd very likely have had to part with some of my roosters because hatching yields roughly 50/50 males and females, and you can't keep a 50/50 sex ratio flock. So it's easy to just hatch what you need on the hen side but you'll always end up with more roos than you need. It can be very hard (and LOUD) to do bachelor flocks for extra roos, and there are always way more people rehoming roos than there are people looking to get one for their hens. Standard roosters also have a serious capacity to inflict injury - much moreso than, say, a small dog/cat. You made a comparison to dogs, but a dog that attacks an injures other people will get put down in many places.
And once an animal is dead...I bury my animals I keep that die naturally because I'm emotionally attached to them. But, if I trap and kill a mouse in my home, I just dump it in the trash or fling it out into the forest for some other creature to eat. Is the mouse somehow less deserving as an animal? Probaly not, but it's a problem for me and I just need it gone. It doesn't seem like animal abuse to me that someone would do something similar with another kind of other animal they aren't emotionally attached to. Something like using a carcass as bait is actually less wasteful in some ways than what I do burying my deceased birds.
Just my two cents as someone who is typing this perhaps weird opinion while I actually have one of my good boy roos sitting on my lap.
