Don't know what speed has to do with ethics in your post.
It can be argued that speed is the ETHICAL thing to have on your side. Speed can sometimes lead to erratic flight, that might not be ethical. Shooting vanes off the shelf might not also be ethical for the same reason, where if you had springy rest or something might work just fine.
Ethics has zero to do with your equipment, and everything to do with you the hunter. You make a killing shot and the deer just makes it over the fence and dies... within 15 feet of the fence... to someone else's property. What IS the ethics of that situation.
You make a shot, the animal jumps over the fence, but collapses... and is crying pitifully in pain now unable to move... just over and into someone else's property. What do you do?
The answers to these questions are both ethical questions and legal questions too. The answer should be obvious.
But take a third example, you are hunting with friends and although drives are illegal, you and a buddy decide that you will both be walking slowly.. still hunting you might say about 100 yards apart, and he spooks a deer that runs right towards you... what do you do?
Ok... never mind... you shoot the deer that is running from your buddy and and you place a "for sure kill shot"... and you and your buddy look for this deer for 4 or 5 hours... you know its dead... just where is it...
It's getting close to sundown and you are walking dejectedly back to your vehicles and out of nowhere materializes a great, by anyone's definition, 10 point.... standing broadside, unaware of your presence, and you are able to nock your arrow and draw.... Shoot or Don't shoot?
Aloha...
