I am sure a capitalist system will NOT work great for a tribe of hunter gatherers!

The problem is not the socialist type of ideas, it is whom you are applying them to and at what point. The society must have certain complexity, capabilities and resources to be successful "socialist".

Going from feudalism to socialism was shown repeatedly not to work (ex: Russia, China). The countries that are currently more socialist and successful were not primarily feudal when they applied the socialist ideas. Also, there are huge differences in what is called "socialism"...

Even in the USA, capitalist came with "socialist ideas", like Henry Ford that said that one more free day will boost his overall sales, but the moment was right. I think he could not have done the same 100 years before.