Would you mind if the story of your incident was published in your local paper? If someone you didn’t know was watching you, would you do the same thing? Would you mind if your mother knew what you were doing? If you answer can “yes” to these, and it’s legal and safe, then go for it.

Ethics are often situational. "Shooting a duck on water" is quoted as an example of unethical behavior. What happens if you've crippled a duck and it's swimming away, and you have no dog? Do you just let it suffer, or is it more ethical to shoot it on the water? Sometimes the right thing is not legal, and sometimes the legal thing is not ethical.
I cannot think of a good case for shooting a turkey out of a roost tree. However, I'm glad that it is not illegal.