Not true... jobs come from people (not just rich) who invest their own capital and take the risk to start a business. Google, Microsoft, Wal Mart, Apple etc... all of them began in such a manner. Without the investments of large investors either directly or through bank loans, hedge/VC funds etc...
As they have grown, they have continued adding jobs as they have expanded. Granted, as companies mature to the point that future expansion is not economically viable, they will stop adding jobs. Then their new goal is to maintain profitability and productivity.
Not sure how it is you think private sector job growth occurs... but would be interested in your counter points.