It's really simple. The plant was shut down and everyone was out of a job - period. A new opportunity presented itself and the only way this could work is for 40% of the workers to work for $14/hour. Every worker has a choice whether they want to work for $14 or not. If they don't then they can go elsewhere.
The only choices are
1 - 60% of workers at current pay, 40% at $14/hour
2 - 100% of workers unemployed.
The UAW should be applauded for keeping those jobs and keeping current wages for 60% of the employees.