Sorry to hear about your problems, I had a hawk take a chicken last Monday. There isn't anything I can tell you since everyone else has given great advice!
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I do not think it is legal to kill them anywhere. Most places even capturing them is illegal. Having a bird of prey in your possession can carry a heavy fine.
Roosters do not always protect the hens with their lives. Nature tells them to survive and if to survive they must flee they will flee. Not all roosters are nice with people either. Many can be dangerous toward kids especially.
Not being negative just realistic.
I just started with chickens this summer, had 1 rooster. While working in the yard I let the birds run around the yard. A hawk flew down over my head after them. I screamed and waived my arms and he flew away . Two days ago I was out with the hens, watching the sky for hawks, and again one flew from behind me and grabbed one. I ran after it making a big commotion and he dropped it, only a foot off the ground. I scooted them back into their covered enclosure. The hen looked unharmed, but lost some feathers. The hawks were so silent I only realized their presence by the air flow on my head. They are not afraid of humans, or are so focused on their prey, they don't see me.