Roos don't try to breed chicks, not even young stupid roos. More often the roosters will protect the chicks as they may be his offspring.
I thought hatching chicks if I wanted would be the way to go economically.. but it all depends. I don't like the girls losing condition when they set. And I don't get eggs while they are. So having a sitting hen isn't exactly free. Even though the incubator doesn't use much energy it also isn't free, especially if you don't already have the equipment. I have learned that I love adopting feed store chicks to my hens, even though it cost a few dollars. It's a great way to add variety. However, I choose to keep my roo because I want the specific breed which seems hard to get in my area without ordering large amounts and ending up with hatchery birds. But I keep my boys separately, at least for now.
Agree with LG, they do go after the most fertile. And even the young pullets who are still working their way into lay give off that vibe (though we only notice the reddening comb. But the boys who go crazy every time a girl accidentally gets in their pen wouldn't have any part of the broody mama who got in yesterday. I'm positive they can "sense" the hormonal changes.
Have to say if I had to put down 2 hens, that cockerel would have been first in line, NO questions asked! And it would NOT have been a difficult decision for me.

But I wonder what it was that happened since I've never heard of anyone putting down hens from mating attempts? My guess might be human error, as in not enough hens or space? Not pointing any fingers, cause we all make mistakes! Just trying to learn something here.
Good luck finding him a home!
Just don't forget there is no shame in letting him feed someone else's family and I feel honored to know where my meat comes from and how it was raised! We all have to eat, and some of us WON'T eat commercially raised chickens because of how they are treated. We vote with our dollars. But we don't feast on store bought and pretend we are too sensitive to eat something that we saw living at our house once. An animal is still an animal no matter who raised it.
But I totally get the emotion behind it too!