"even with intesive production the amount of food that can be produced is
small comapared with the full nutritional needs of a family" and..."I also
don't see any significant unique psychological change as a result of growing
one's own food. There are a lot of jerks who grow gardens."
In both instances he is wrong.
It is possible to produce a high percentage of a family's nutritional needs.
(Jeavon's - How to Grow More Vegetables...; Hunt and Boertz - High Yield
Gardening; Coleman - Four season Harvest)
Secondly, apparently, not all of them grow gardens.