Uncle Matt made the point I was going to bring up -- Ethics have to do with what is morally right or wrong. So, is it morally wrong for someone to shoot a legal deer that you would choose not to shoot? Get serious.
Now, just for funsies...
Is it ethically/morally wrong to shoot a big buck (8+ points) and not mount it or keep / display the antlers?
Pretty absurd argument, isn't it. Yet it's right in line with the original line of reasoning.