Same thing happend here in Michigan and is getting more and more common as the deer herds grow in suburbia. I stayed up to date on the debate whether to allow hunters in the park or hire sharpshooters. Came down to liability and lethality. The sharpshooters are deemed to be a pest removal service and they operate as a Corporation. Thus they have liability insurance that relieves the park and owner.
Also, since they are hired as a subcontractor to complete the removal of animals doing damage, they are not held to hunting regulations. Therefore, they can use high power weapons, bait, lights, night vision scopes, etc...
They did donate all the meat to the local homeless shelters. There was also something mentioned about PETA being unable to protest as this was a hired subcontract. I do not know the details on that aspect, but I think the people just wanted the destruction on the Park properties to stop.