I see you were originally arguing that free trade policies weren’t to blame for the loss of manufacturing jobs as evidenced by the increase in overall US manufacturing output compared to the total number of manufacturing workers. IOW, job losses have resulted from technological advances which have replaced workers. I think that technology has certainly increased the productivity of the US manufacturing employee but I disagree that this is the only reason we have seen an increase in productivity, IOW, I disagree with the premise that outsourcing and offshoring have not contributed to manufacturing sector job losses. I think there is a bit of truth to both sides of the argument but it is completely false to assert that one or the other is is the exclusive cause.
You may be thinking of someone else. I leave blame to experienced professional blamers.
Let's go with facts, like how import taxes are lower now than they were in '72. Now, lots of people say lower taxes are bad for us, but even though over the past 37 years fewer people work for factory owners, US manufacturing output about tripled, household real incomes are up 80%, and last July's unemployment rate was the same as it was in July '72. So lower import taxes did not shut down manufacturing, did not bring on unemployment and did not hurt incomes.
Now that Obama's raised import taxes, 5 million people lost jobs, factory output is down, and incomes have fallen. No matter who you blame, it's a fact that higher import taxes hasn't help us.