If the buck had to die,
It's an bigger question that it seems, and I personally have difficulty with it too. We do our best to respect nature, and we try to do our best not to waste. I am personally well beyond the need to kill anything, but I do believe it is a skill set I need to pass to my children. I very much enjoy hunting, but it is through my children. I get invited to hunt all the time, and I always ask the same question - "can I bring my boys." If the answer is no, I almost never go.
The other issues is starvation. Where we hunt, the deer are terribly overpopulated. Combine that with the constant drought, and the food situation is desperate. We have found the caucuses of several starved deer this year as we do most every year. There is a need to thin the herd. Texas has a program called "Hunters for the Hungry" which brings hunters and those in need together, and we also work with the local land owners to find people in the local communities in need to whom we donate meat.
So did the buck need to die? I don't know, but I feel like I'm doing some good on several levels.