In the postwar period, American manufacturing had far less competition than it does now. Most other industrialized countries were recovering from the war, foreign cars did not fit American consumer preferences, and China was locked into a decades-long cycle of self-destruction. Automation technology wasn't very good, so there were tons of factory jobs. All of that has now changed.
This man's job, and the other jobs like it, only existed because of historical circumstances that cannot be replicated. Politicians might be able to save some manufacturing jobs, but we will never have nearly as many as we did before.
I feel sorry for this man, because jobs like his aren't coming back, and because he is being lied to by politicians who say those jobs can be saved.
It's possible that what we are now seeing is the end of a historical and economic anomaly: a mass middle class. Our politics is not handling it well.