Hayao Miyazaki's deep meanings

Notice how in Princess Mononoke almost everyone is good? Even Lady Ibashi, who is destroying the forest, is doing it for the good of her people. She takes in lepars, and helps former prostitutes better their lives.
I believe that Miyazaki is saying that although the purpose may be good, we still need to treat Earth better, or we'll loose it. This movie has such deep meanings, look into it and you'll see.