Culling birds of any species should be an absolute last resort, as a bird enthusiast I do not like to see any bird species killed, Cormorants are very sensitive to disturbance at nesting time, why not disrupt them at breeding time and other birds such as Canada Geese and Mute Swans also can be harassed away from nesting attempts. I have just recently returned to Ont after being in the United States and I am greatly annoyed by the way Mute Swans are being targeted as highly invasive and culled, whereas I don't see anything being done about feral pigeons and European Starlings which are everywhere. It seems the only reason biologists want to get rid of them is because they are not comercially exploitable for hunting purposes, there are many deliberatly introduced game animals which are hunted and regulated but no one is calling for their elimination, such as Fallow Deer and Ring-necked Pheasant. Nature is usually pretty good at levelling populations without our "help".
I'll leave it at this, because I enjoy birds in all shapes and sizes and wish everyone loved then as much as I do.