I’d argue that even if you waste everything from hunting deer, in most areas of the US fact their is now one less deer is definite ecological benefit all on its own.

A forest with a large deer population where people don’t landscape and fence every tree is going to become either a near monoculture with the only exceptions being invasive species. This is because deer eat most but not all native saplings before they can grow to the point they can survive a deer attack, and with most forests in the US having far, far higher populations than natural we get far fewer native trees than natural.

Normally anything like modern deer levels would have led to a population explosion of predators to keep them in check, but because most deer predators are far more vulnerable to human presence, activity, and historical control efforts than deer, which thrive in human dominated areas, the result has been significant damage to forests.

As such, anything like hunting that can lower the deer population back towards natural is very enthical as it doing far more to protect the forest than any number of newly planted saplings could ever do. Your mileage may very, all forests arn’t the same, check the ecology of your local forest before hunting to figure out what the forest needs more of and what it need less of, etc…