one have domesticated deer, offered good conditions for it to breed (protected it from other predators including hunters like himself) and then he and his children prospered off their cattle...
the other one just hunted his food to extinction...
guess who's children have survived to tell the story?
All of mine - and your - ancestors have done just that. They found new sources for food or they didn't become our ancestors.
I get what you are saying about hunting one's food to extinction, how it's a bad idea.
Do you get what _I_ am talking about when I say that poachers don't _care_ about tomorrow, that they are do poor and desperate that today is all that matters?
And many groups and individuals that failed to evolve towards agriculture either died or have been thrown in slavery (as civilizations with agriculture developed more rapidly than the others without it - that's how cities started to emerge, as suddenly bigger groups could live together).
I get what you're saying too. Personally I would do anything to keep my child from starving. But extinct species are NOT in danger because of poor people that are fighting for their lives. And not all poachers are poor, not all poachers have an excuse, quite the contrary.
Owning a ranch typically isn't a poor man's occupation. It requires investments in land, improvements to the land, food for the animals when the land is unable to support them, etc.