Because those are low margin, labor intensive products which are more cheaply made overseas in places like Asia. And that is why, regardless of what Trump says, you're not going to see that kind of manufacturing returning to the U.S.
Slap a 20% tariff on that junk. We have to pay true market price for imported goods to pay for the social costs. I don't like it but the "displaced" get to vote.
The cost of de industrialization.....