I realized something about permaculture. It is the same insanity in a new deceptive clothing.
every permaculture manual I have read promotes bringing together useful plants from all over the world to create a food garden for humans and their domestic animals.

The main problem with this is it introduces new alien (possibly invasive) plants into the ecosystem. It robs the native insects, birds and butterflies for food. It creates a sterile landscape.

I am sure when the developer of Western permaculture looked on the native homegarden of various indigenous people, particularly Africa, Southeast Asia and South America, they thought they could do better.

They probably thought they could do better by not being limiting the permaculture garden to indigenous plants like the original homegardens. Westerners utilize the vast globalness of trade and capitalism to bring together plants form all over the world. And therein lies the problem.

Gathering together from all over the world doesn't create a working ecosystem. It creates a mish-mash. Plants form Korea, South Africa, and Mexico probably can not be eaten by indigenous insects. The insects can not be eaten by the birds, and animals population are starved.

Don't believe me? Douglas Tallamy explains the connection between indigenous insects and plants in Bringing Nature Home.

I suspect if I point this out to permaculture advocates I would meet with resistance and negativity. I just hope they would think about it.