I agree completely with you. For food/defense, all carnivore animals do it, and even herbevores will kill for defense. Pretty much all animals kill when it's the only way to survive. But for sport, I don't believe that it's okay.
This is just my opinion though, and I don't know what it's like to hunted for sport. Might be fun to run away for your life? I don't know, maybe the adrenaline makes you feel awesome? I doubt it though, and I probably wouldn't like being hunted, which is why my opinion is this way.