I fish the open waters of…

I fish the open waters of Lake Ontario. I see the flocks of birds, I understand the negative impacts. I don’t understand why there should be a hunting season on a bird that won’t be eaten.
Why allow the bird to grow to the size that it needs to be hunted to control the impact it has on an environment?
People go on and on about the bird and how awful they are and the detriment that they cause to fish stocks and trees. Why not simply cull the eggs? Why not sterilize a flock.
I’m not a hunter nor am I a bio but it seems like a lot of work and effort so a bunch of guys in camo with shotguns can try to control an issue that can be dealt with before it even becomes a issue!
How will a cormorant hunt help someone that lives in the city limits of a major city like Toronto where there is no hunting permitted?