“If you unionize, all the jobs will leave” is the oldest refrain in the book for those opposed to united labor.
In regards to the auto industry, I'm not sure what you mean by "look where auto manufacturing investment in the US is". Most auto manufacturing jobs are still in the rust belt [1]. Most EV Production investment is in the rust belt [2].
[1]: https://engaging-data.com/auto-manufacturing-state/
[2]: https://www.assemblymag.com/articles/98988-ten-us-states-dom...