I would prefer to have an actual example of man having a purpose and doing it. So far man = 0
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I saw that video. But man is supposed to be the better species, so an animal attack (which in the example you gave was the guy's fault for doing what he did and getting close to them, not saying he deserved it, but I can't blame the animal) from a lesser species is understandable, but an actual thought out act from another human being is the worse crime in the context of morals and values IMO.
So far I am not even slightly swayed.
Asked yourself how are you typing on a keyboard and understanding everything around you, your surroundings, religions of the world that are true upholding one's self and all God's creations---then get in your car drive down to the park, and then look at your dogs and wonder why that can't do what you just did...Free Will is part of the answer..
and if it weren't for man, you wouldn't have a dog, or a pet, or should I say, ownership of another creature that you ultimately deem inferior to you, because you must own it.
To rationalize what man hasn't done, or his purpose is to rationalize what you are doing to contribute to the lack of "purpose".