Did I understand the ending right?

Did I understand this right?
If I did then this is one of the bleakest, most miserably haunting endings ever.

At the climax of the film Dafoe kills (possibly) the last Tasmanian Tiger. He does it because the biotech industry want it so bad they wont stop hunting it and that hunting has already caused the death of the kid's father, the death of the mum and daughter and the death of the second hunter behind Dafoe. The search for this creature is wreaking such a trail of destruction that Dafoe shoots this magnificent creature and destroys it, dooming the species to extinction forever in order to stop the human folly and misery that it's causing.

Did I get this right or have I missed something?

I think I need to lay down for a while.