Define good (without any reference to books, teachers, traditions, etc. and make sure everyone agrees with your definition). If you can not this whole schema collapses as indefinable.
:think: Well, to me (for what it's worth) good is that which is beneficial to myself and/or others, but doesn't cause harm to others. (I'm sure your analytical mind will pick this apart.)
So if one person on the globe is hampered then the principle is invalidated? How about animals and plants... don't they count? Think of the pain the grass experiences when you walk across it barefooted. Or the pain an ear of corn fields when it is ripped from its stalk and boiled so you can ingest it and bathe it in stomach acid!
I believe the "one and all" refered to in the text I quoted is in reference to sentient beings. I know that the definition of "sentient beings" is open to debate, but plants probably aren't sentient, at least not in the same way higher life forms (humans and other animals) are.
This is cotton candy morality. Tastes sweet but disintegrates when swallowed.