We have no duty other than to our own survival, if that means that certain animals and insects are useful to us... then so be it, we have a duty to protect them for our own benefit.
The Rhino is useless in this regard, which is why there isnt such a massive furore over it... unlike perhaps Bees. When we can sustain our own environment, they're all useless to us beyond sentiment. That simply is reality. I'd rather we have as many different varieties of wildlife as possible, but its humans first and always.
You really think that or just arguing in the thread, which i understand because sometimes i "take the dumb opinion" too to get debate going.
This Rhinos life was worth easily 100 trash humans living in Squalor in any 3rd world desert or hole. Certainly worth more than the people that killed it.