More abstractly the people may have hoped to support the work of their fellow countrymen, and would instead have been undercutting them with overseas labor. That loss is not financial, but in the way the US works perhaps some monetary value could be conjured for this as well. Or perhaps that loss is considered equal to the amount they overpaid for the product.
In any case I think I’ve convinced myself that the customers should receive some financial compensation and the company should be required to clearly notify people of what they have done, to scrub any goodwill they earned that could have led to an increase in future purchases at the store.
Judging by the actual response, it's not something that rises to the level of requiring compensation, because the injury is imaginary.
Said differently, the customer lost the freedom to support a product actually made in the US while simultaneously supporting something they didn't mean to.
After the last decade of lead contamination and other toxic products from China, I would imagine some parents are wary of a product they spend close proximity to for 10 hours every night for years.
https://www.thestreet.com/opinion/china-has-a-history-of-sel...
I don't know how you'd quantify that as a function of the product's price, but they figured out a way to put a price tag on emotional damage so I'm sure someone can figute it out.