Who owns GM?
We do, through purchase of their stocks, our pension, savings, bank, credit union, etc. purchases of their stock (owned mostly by investors, not the corporation). I think I have said this before.
They provide hundreds of thousands of jobs within the company and have contributed to many more in businesses that use their products.
As stockholders, we have a vote on policies; if nationalized, none.

The system needs improving, but it has served us well for generations.

Rich means entrepreneurship and application of creativity. Without the ability to borrow, grow and create wealth, Gates and Microsoft, Dell, and a thousand others would never have succeeded.