The first priority needs to be keeping the virus out of the human food chain, but the second priority needs to be giving the virus opportunities to evolve to be

The first priority needs to be keeping the virus out of the human food chain, but the second priority needs to be giving the virus opportunities to evolve to become less lethal. It will (as COVID did), because dead hosts are no use to it. I don't know whether culling flocks is better for that purpose than taking the additional time to let the virus kill the birds, but we need to be doing whatever accelerates the evolution of the virus.