They are playing within the trade rules set up by government. If they don't sell the Chinese crap, someone else will and will undercut them on price eventually driving them out of business. If it were a matter of principle they would be arguing for the government to raise import tariffs, to help American manufacturers. But don't expect them to unilaterally try to overturn international trade policy.
Raising tariffs isn’t the answer as has been proven time and again. Eliminating or greatly reducing corporate taxes is what needs to be done to even the playing field.