E.T. is merely pointing out that human progress is part of a natural phenomenon which is the human brain which has led to advances such advances that has made us able to control many factors in ‘nature’. This is not arrogance as you put it. Also if you actually were to tell your clients who ask for a garden to encourage wildlife to just close their backdoor and not go out, you may in time run out of clients. There is nothing wrong in us aspiring to bring some form of nature nearer our dwellings and thereby have an interaction otherwise not possible with nature. I for example believe in gardens as potential nature reserves on a small scale rather than the manicured gardens that are the hallmark of most English gardens with sterile lawns, well behaved bushes cut to shape and weedless perfectly proportioned borders.