Here, as on the Wall and with Tyrion at Winterfell, the episode makes the point that self-interestedness does not automatically mean evil, nor is righteousness automatically the best guide.
From the tunedin.blogs.time.com
We are no better than a mindless virus and all the talk of preservation and care for the environment is blatant rhetoric to disguise the greed, vanity and self-interestedness of those who have power.