What is appropriate reason for hunting?

In what state of mind and reason is appropriate for hunting?
For myself, I will only hunt if I need to. I believe this is showing my respect towards Gods creatures and using them correctly. For my friends, they hunt because it is fun. When they hunt they do eat their kill but they do not need the food and they believe that it is fun to kill. I think my friends state of mind and reason (fun to kill) when hunting is inappropriate and bad. Am I incorrect about this issue? I tried finding this question but couldn’t find the exact answer. Thank you.

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