He was a Jew, who hated Jews.
You say that his theories are "crackpot"; yet YOU espouse them. What does THAT make you; dear? LOL
Merely saying isolation is a theoretical possiblity is different from espousing it. And an isolationist society is just as likely to be capitalist as socialist.
The capitalists would just have to work harder to achieve a high standard of living, leaving less left over for profligates and parasites.