As someone noted,
The American manufacturers aren't going to come in and sell them at the lower price. All that's being done is lower the demand after raising the prices. This is going to put a lot more people who were installing the panels out of work than the number of people who ever going to be employed making them. There are 10,000s people in the US working to install panels and that work can't be outsourced to any other country. Who cares where the panels come from? The cheaper they are, the more projects (residential and industrial) will become viable and started meaning more people employed.