Please don't kill them as they are dear little things. Gve them to someone!
Well, unfortunately you just can't have dozens of roosters running amok - no matter how quiet or tame you think they are they eventually grow up and start fighting. They will beat the living stuffing out of those under them and make life generally miserable for the lower ranking males. And if you have females in the mix it is even more drama and stress.
The unfortunate truth of the matter is you just can't have all these males running around, and there are not enough people that have the space for one 'pet' chicken - and roosters generally do not make good pets like hens do.
Oh I know there are those 'one off' roosters out there that make great pets but the majority of them are not pet material.
If you have livestock you are going to need to find a way to deal with the male critters. And unfortunately Rooster are not that easy to castrate.
In my humble opinion roosters are not 'dear little things'!!! And many hens are also not dear little things - chickens are devious and smart, they are also opportunistic and will take any opportunity they can get to steal food, eggs, sex, kill chicks, and generally cause mayhem and disorder.
I think that is why people enjoy chickens so much - its like a TV drama that runs 24/7!
The old saying goes 'you got livestock - and you got deadstock'.... that's life.