Blaming this on the amorphous "left" is extraordinary, when offshoring has been a 40 year project of corporate America and "shareholder returns at any cost". A neoliberal global order has been the traditional Republican platform.
1) The democrats hypocritically supports offshoring while claiming to support workers
2) The republicans explicitly (prior to Trump, but MAGA is not very similar to traditional Republicans) support corporations and offshoring as a mechanism for increased profits
And so we blame "the left"?